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Re: How short can I go one a .308 barrel? [Re: TFF Caribou] #6057796 11/30/15 03:00 PM
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Originally Posted By: DocHorton
I'm surprised there is so little velocity lost from 24" to 16"...good to know. Makes me want to cut my bolt guns even shorter.

Do it.



Originally Posted by unclebubba
Just to make sure that it is done thoroughly, I go both ways.

Re: How short can I go one a .308 barrel? [Re: TexFlip] #6057818 11/30/15 03:12 PM
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Originally Posted By: TexFlip
Velocity isn't the end all be all gauge of performance. You can have a 24" 308 that shoots faster than a 16" but if it shoots bigger groups it doesn't perform as well as the 16".


EXACTLY!


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Re: How short can I go one a .308 barrel? [Re: TexFlip] #6057829 11/30/15 03:18 PM
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Originally Posted By: TexFlip
Velocity isn't the end all be all gauge of performance. You can have a 24" 308 that shoots faster than a 16" but if it shoots bigger groups it doesn't perform as well as the 16".


x1000000000000000000000


You cant shoot fast enough to miss...

ps to whoever made the wise crack about cutting your long range gun short... Look up the bench rest "rail" guns... Consistently the smallest shooters around... look at those barrels... NOT long, VERY heavy


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Re: How short can I go one a .308 barrel? [Re: TexFlip] #6057844 11/30/15 03:25 PM
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Originally Posted By: TexFlip
Originally Posted By: DocHorton
I'm surprised there is so little velocity lost from 24" to 16"...good to know. Makes me want to cut my bolt guns even shorter.

Do it.




Flip...I love that rifle every time you post that pic. How long is it and what caliber?

I have a 20" in .223, a 20" in .308, a 22" in .243, a 22" in 7mm-08. I kinda hate to spend $400 to cut all the barrels down but your rifle makes me want to do it.

I'm not sure I would ever need to shoot over 500 yards in my life, furthest kill shot on anything I've ever taken is about 250.

What say the THF brethren on the barrel lengths for the above mentioned guns to still be able to kill mule deer sized game at 500 yards and in? (Not with the .223 smile )

Re: How short can I go one a .308 barrel? [Re: DocHorton] #6057857 11/30/15 03:29 PM
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Originally Posted By: DocHorton
Originally Posted By: TexFlip
Originally Posted By: DocHorton
I'm surprised there is so little velocity lost from 24" to 16"...good to know. Makes me want to cut my bolt guns even shorter.

Do it.




Flip...I love that rifle every time you post that pic. How long is it and what caliber?

I have a 20" in .223, a 20" in .308, a 22" in .243, a 22" in 7mm-08. I kinda hate to spend $400 to cut all the barrels down but your rifle makes me want to do it.

I'm not sure I would ever need to shoot over 500 yards in my life, furthest kill shot on anything I've ever taken is about 250.

What say the THF brethren on the barrel lengths for the above mentioned guns to still be able to kill mule deer sized game at 500 yards and in? (Not with the .223 smile )


Non-issue (with the right shooter and bullet it could be DONE with the .223 buuut shot placement is KEY.) I mean you can kill them with a needle is you put it in the right spot but... I like a little more wiggle room... Heck with the 7mm-08 and .308 elk wouldn't be out of the question, though most elk hunters will turn up their nose... Belted mags and elk hunters go together like pb&j


Sombody smells like fried borritos...
Re: How short can I go one a .308 barrel? [Re: TFF Caribou] #6057870 11/30/15 03:35 PM
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It's a 16.25" 6.5 Creedmoor. Horizon Firearms built it for me. I shot a 200lb axis at 310 yards with it a couple weeks ago. DRT.



Originally Posted by unclebubba
Just to make sure that it is done thoroughly, I go both ways.

Re: How short can I go one a .308 barrel? [Re: TexFlip] #6057874 11/30/15 03:36 PM
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Originally Posted By: TexFlip
Velocity isn't the end all be all gauge of performance. You can have a 24" 308 that shoots faster than a 16" but if it shoots bigger groups it doesn't perform as well as the 16".


That's a big "if"...



I have a 24" barreled rifle that will put five rounds into .317". (Best so far) It very seldom puts five rounds into more than 1/2" at 100 yards. (This assumes that I'm doing my part.)

Artillery (the champions of long-range performance) tend to have barrels that are quite long. - I wonder why they do that?

Facts are so much more instructive than strawmen, don't you think?

Short-barreled firearms can of course be accurate, so can long-barreled ones. - But this is not true where velocity is concerned. No matter how much lipstick you put on a short-barreled pig, the longer barreled rifle with the same ammunition is going to send it downrange at a higher velocity, and at a given range, that same bullet will do more damage when it strikes.

Period.

Last edited by charlesb; 11/30/15 03:42 PM.

Kind regards, charlesb


Re: How short can I go one a .308 barrel? [Re: J.G.] #6057887 11/30/15 03:43 PM
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Originally Posted By: FiremanJG
Originally Posted By: TexFlip
Velocity isn't the end all be all gauge of performance. You can have a 24" 308 that shoots faster than a 16" but if it shoots bigger groups it doesn't perform as well as the 16".


EXACTLY!


Exactly nothing. - Strawman arguments prove that, every time.

Last edited by charlesb; 11/30/15 03:54 PM.

Kind regards, charlesb


Re: How short can I go one a .308 barrel? [Re: Colt W. Knight] #6057897 11/30/15 03:50 PM
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Originally Posted By: Colt W. Knight
Here is a neat ballistic test where a guy shot four types of ammo, and cut one inch off his barrel from 28-16"
http://rifleshooter.com/2014/12/308-winc...ity-28-to-16-5/

In my opinion, that loud banging noise of the longer barrel hitting the blind is a bigger issue than the 100 fps velocity you loose from ~20" barrel to 16.5''.



This chart does not agree with the results that I have heard from multiple sources (not just one) - that velocity losses per inch with many cartridges tend to the neighborhood of 100-150 fps per inch. This chart claims that eight inches lopped off only loses you 200 fps.

Was the chart made up by the owner of a short-barreled rifle, by any odd chance? - That would go far in explaining the rather extreme discrepancy there.

Whoever made up the chart should get into contact with the global warming enthusiasts, he'd be very popular with that group.

Last edited by charlesb; 11/30/15 03:52 PM.

Kind regards, charlesb


Re: How short can I go one a .308 barrel? [Re: TFF Caribou] #6057909 11/30/15 04:01 PM
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I've talked to a lot of people and NEVER heard of 100-150 fps per inch.


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Re: How short can I go one a .308 barrel? [Re: TFF Caribou] #6057911 11/30/15 04:03 PM
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You are missing the point Charles, the guy isn't shooting long range, 300yds at the most. A shorter barrel in the eyes of the OP will be more handy and still be effective at Its intended use of hunting shorter ranges.

If we were talking long range shooting you would be right, you lose a little effectiveness at 800+. We aren't talking long range shooting.

Practicality changes depending on use.

Last edited by TDK; 11/30/15 04:05 PM.

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Re: How short can I go one a .308 barrel? [Re: TFF Caribou] #6057915 11/30/15 04:09 PM
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bud your hung up on velocity as a measure of value... It is arguable the most meaningless measure of a load... You ladder test and your accuracy nodes are what they are with a given round.

Precision is the measure of a rifle PERIOD... In hunting situations or target situations rounds on target is what gets the job done... Less hold over is a bonus yes but it isn't the end all be all of anything... If it was all the precision shooters would shoot belted mags or tiny little burners... they don't, most shoot mid caliber HIGH BC rounds ie: 6.5 creed

Also is speed was THAT big a deal everyone would load the absolute lightest round they could... But you see a leaning for HEAVY for caliber rounds because they carry the energy better...

Pull up kinetic energy charts... cause that is what your arguing... that the change in kinetic energy is dramatically different... it isn't... It is less but not by a meaningful margin.

What artillery are you talking about??? real altery like military uses??? Like a howitzer lets look at the ratio of total OAL of round to length of barrel. you'll be surprised how short they are.


Sombody smells like fried borritos...
Re: How short can I go one a .308 barrel? [Re: charlesb] #6057923 11/30/15 04:12 PM
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Originally Posted By: charlesb
Originally Posted By: Colt W. Knight
Here is a neat ballistic test where a guy shot four types of ammo, and cut one inch off his barrel from 28-16"
http://rifleshooter.com/2014/12/308-winc...ity-28-to-16-5/

In my opinion, that loud banging noise of the longer barrel hitting the blind is a bigger issue than the 100 fps velocity you loose from ~20" barrel to 16.5''.



This chart does not agree with the results that I have heard from multiple sources (not just one) - that velocity losses per inch with many cartridges tend to the neighborhood of 100-150 fps per inch. This chart claims that eight inches lopped off only loses you 200 fps.

Was the chart made up by the owner of a short-barreled rifle, by any odd chance? - That would go far in explaining the rather extreme discrepancy there.

Whoever made up the chart should get into contact with the global warming enthusiasts, he'd be very popular with that group.


I've heard 25-50 usually per inch. At 150fps per inch, going from 24" down to 16 would be a loss of 1200 fps.


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Re: How short can I go one a .308 barrel? [Re: TFF Caribou] #6057926 11/30/15 04:13 PM
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I'm getting 2715 fps with factory 120 Amax. Hornady has 2910 fps in a 24". It's about 25 fps an inch for mine.


Originally Posted by unclebubba
Just to make sure that it is done thoroughly, I go both ways.

Re: How short can I go one a .308 barrel? [Re: TFF Caribou] #6057942 11/30/15 04:25 PM
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"Was the chart made up by the owner of a short-barreled rifle, by any odd chance? - That would go far in explaining the rather extreme discrepancy there"....

The article states that the shooter started with a 28" bbl....Does he also own a short-barreled rifle, who knows.
He cut an inch at a time and measured the results, vs. your "I have heard from multiple sources..."

P_102


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Re: How short can I go one a .308 barrel? [Re: TFF Caribou] #6057950 11/30/15 04:29 PM
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20" 7mm-08 is pushing a 162 A-max 2635 fps, MV, and that was the low node during load development. I have no doubt the velocity is correct, I push that bullet to 800 yards weekly.

20-25 fps per inch is not only rule of thumb, it has been observed by many shooters, including THF members here.

You have to have one man making an argument to have a straw man. Everyone else in this thread is agreeing, except you. Who's the straw man?


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Re: How short can I go one a .308 barrel? [Re: catslayer] #6057951 11/30/15 04:32 PM
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Originally Posted By: catslayer
bud your hung up on velocity as a measure of value... It is arguable the most meaningless measure of a load... You ladder test and your accuracy nodes are what they are with a given round.

Precision is the measure of a rifle PERIOD... In hunting situations or target situations rounds on target is what gets the job done... Less hold over is a bonus yes but it isn't the end all be all of anything... If it was all the precision shooters would shoot belted mags or tiny little burners... they don't, most shoot mid caliber HIGH BC rounds ie: 6.5 creed

Also is speed was THAT big a deal everyone would load the absolute lightest round they could... But you see a leaning for HEAVY for caliber rounds because they carry the energy better...

Pull up kinetic energy charts... cause that is what your arguing... that the change in kinetic energy is dramatically different... it isn't... It is less but not by a meaningful margin.

What artillery are you talking about??? real altery like military uses??? Like a howitzer lets look at the ratio of total OAL of round to length of barrel. you'll be surprised how short they are.


^^Couldn't have said it better myself!^^ up


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Re: How short can I go one a .308 barrel? [Re: TFF Caribou] #6058092 11/30/15 05:47 PM
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See page 322 of Hatcher's Notebook for a chart of barrel length vs velocity tests.

Re: How short can I go one a .308 barrel? [Re: TFF Caribou] #6058103 11/30/15 05:50 PM
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This is the test I was looking at when thinking about SBR'ing my 308. They go goes from 26" barrel down to 13.5" barrel with several different loads.

pictures for the graphs at link below.

Link to Test

Quote:
Explaining Velocity:

Belief: Now that we know that accuracy is pretty much the same, short barreled rifles lose too much velocity be effective at long ranges.

Fact: This is a double-edged sword. The 13.5-inch length could propel a 168 grain Hornady TAP round at an average velocity of 2390 fps, which is hardly slow. That is only a decrease of around 315 fps from the 26 inch length (25.2 fps/in), and vindicates many researchers who pioneered velocity discussions. There was no noticeable critical difference in accuracy at any range. There is a downside to longer ranges and reduced velocities, that being increased susceptibility to wind as range increases. Increased drift is not the end of the world, though, and if measured properly, can be overcome with ease.

What is more is the differences in velocity across loads and barrel lengths. The issue with barrel length and velocity was also interesting in that, across all bullet weights, the extreme variation is only 31% (110 VMAX @3202 and 208 AMAX @2215). In the most accurate load, the 168gr HPBT handload, the velocity difference between longest and shortest was only slightly more than 15%. The round with the least variation between barrel lengths was the 175gr Federal Gold Medal Match with slightly less than 8% variation.


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Re: How short can I go one a .308 barrel? [Re: KRoyal] #6058123 11/30/15 06:00 PM
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Stop muddying the water with facts, Kyle!


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Re: How short can I go one a .308 barrel? [Re: TDK] #6058935 12/01/15 12:07 AM
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Originally Posted By: TDK
You are missing the point Charles, the guy isn't shooting long range, 300yds at the most. A shorter barrel in the eyes of the OP will be more handy and still be effective at Its intended use of hunting shorter ranges.

If we were talking long range shooting you would be right, you lose a little effectiveness at 800+. We aren't talking long range shooting.

Practicality changes depending on use.


I intend to do the same thing, for the same reason. I also will not be shooting over 300 yards at game, I never do.

There is a point of diminishing returns though when it comes to paring down the length of a rifle barrel. The power goes down, the unpleasant muzzle blast goes up, so that the rifle is no longer enjoyable to shoot and is not as effective with a given load.

You can remove barrel length fairly easily, but adding some after you've discovered that you removed too much is another story. I think that an 18" barrel is quite handy, and do not see any good reason to go much shorter than that.

I remember being at the range with my M1A Scout Squad with its 18 inch barrel and muzzle brake. - I thought it was loud and obnoxious until a guy with a 16" SOCOM showed up.

That last two inches made an amazing difference in the noise and blast involved. (with a .308) All of that extra noise and blast comes from the powder burning outside of the barrel, instead of pushing the bullet. Remember that it is the bullet that does the work, we are not out there trying to scare the deer to death.

Was the SOCOM more 'handy'? Sure - by about two inches. I felt sorry for the guy. He had to double up on his hearing protection, but I got by just fine with a pair of disposable foam plugs.


Last edited by charlesb; 12/01/15 12:24 AM.

Kind regards, charlesb


Re: How short can I go one a .308 barrel? [Re: Sniper John] #6058972 12/01/15 12:21 AM
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Originally Posted By: Sniper John
See page 322 of Hatcher's Notebook.


It's public domain, you can get it at archive.org


Kind regards, charlesb


Re: How short can I go one a .308 barrel? [Re: charlesb] #6059030 12/01/15 12:46 AM
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Originally Posted By: charlesb
Originally Posted By: TDK
You are missing the point Charles, the guy isn't shooting long range, 300yds at the most. A shorter barrel in the eyes of the OP will be more handy and still be effective at Its intended use of hunting shorter ranges.

If we were talking long range shooting you would be right, you lose a little effectiveness at 800+. We aren't talking long range shooting.

Practicality changes depending on use.


I intend to do the same thing, for the same reason. I also will not be shooting over 300 yards at game, I never do.

There is a point of diminishing returns though when it comes to paring down the length of a rifle barrel. The power goes down, the unpleasant muzzle blast goes up, so that the rifle is no longer enjoyable to shoot and is not as effective with a given load.

You can remove barrel length fairly easily, but adding some after you've discovered that you removed too much is another story. I think that an 18" barrel is quite handy, and do not see any good reason to go much shorter than that.

I remember being at the range with my M1A Scout Squad with its 18 inch barrel and muzzle brake. - I thought it was loud and obnoxious until a guy with a 16" SOCOM showed up.

That last two inches made an amazing difference in the noise and blast involved. (with a .308) All of that extra noise and blast comes from the powder burning outside of the barrel, instead of pushing the bullet. Remember that it is the bullet that does the work, we are not out there trying to scare the deer to death.

Was the SOCOM more 'handy'? Sure - by about two inches. I felt sorry for the guy. He had to double up on his hearing protection, but I got by just fine with a pair of disposable foam plugs.



I have a 16 in lr308. Muzzle blast is no where near as bad as you say. Its not much different then the 24in upper. The double hearing protection is normal for most brakes. I do it when shooting my braked 24in 300win mag.

If the deer is hit properly at 2200fps or 2000fps(impact velocity), you still get a dead deer. Also within 300 yards drop and drift difference in a 16 vs 20 is going to be negligible.

Re: How short can I go one a .308 barrel? [Re: charlesb] #6059227 12/01/15 01:48 AM
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Originally Posted By: charlesb
Originally Posted By: TexFlip
If you don't want to stamp it 16" AOL with a pinned brake. If you want to stamp it I wouldn't go shorter than 12".

I'd like to hear the "physics" behind short barrels being poor performers.


It's not exactly rocket science. With shorter barrels, especially shorter than 18" with a .308, you are going to get lower velocity which means (you guessed it!) less useful performance.

I thought everybody understood that much... Whatever you may feel that you have gained with a shorter barrel, in order to get that, you must also give something up.

There ain't no such thing as a free lunch.

See the chart posted above. Note the clear trend it displays.

"Performance" in the shooting world, (especially for hunting weapons) is most often measured by velocity with a given bullet weight - and guess what?


Originally Posted By: charlesb
Originally Posted By: Colt W. Knight
Here is a neat ballistic test where a guy shot four types of ammo, and cut one inch off his barrel from 28-16"
http://rifleshooter.com/2014/12/308-winc...ity-28-to-16-5/

In my opinion, that loud banging noise of the longer barrel hitting the blind is a bigger issue than the 100 fps velocity you loose from ~20" barrel to 16.5''.



This chart does not agree with the results that I have heard from multiple sources (not just one) - that velocity losses per inch with many cartridges tend to the neighborhood of 100-150 fps per inch. This chart claims that eight inches lopped off only loses you 200 fps.

Was the chart made up by the owner of a short-barreled rifle, by any odd chance? - That would go far in explaining the rather extreme discrepancy there.

Whoever made up the chart should get into contact with the global warming enthusiasts, he'd be very popular with that group.


First, you reference the chart as support for your argument, then you try to mock and discredit it. I posted the link to the original source of the chart. The gentlemen goes into detail about his materials/methods and results. I always find that "sources" are much more credible when they are not anonymous.

Re: How short can I go one a .308 barrel? [Re: TFF Caribou] #6059309 12/01/15 02:22 AM
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Originally Posted By: Tff caribou
Originally Posted By: charlesb
Originally Posted By: Colt W. Knight
Here is a neat ballistic test where a guy shot four types of ammo, and cut one inch off his barrel from 28-16"
http://rifleshooter.com/2014/12/308-winc...ity-28-to-16-5/

In my opinion, that loud banging noise of the longer barrel hitting the blind is a bigger issue than the 100 fps velocity you loose from ~20" barrel to 16.5''.



This chart does not agree with the results that I have heard from multiple sources (not just one) - that velocity losses per inch with many cartridges tend to the neighborhood of 100-150 fps per inch. This chart claims that eight inches lopped off only loses you 200 fps.

Was the chart made up by the owner of a short-barreled rifle, by any odd chance? - That would go far in explaining the rather extreme discrepancy there.

Whoever made up the chart should get into contact with the global warming enthusiasts, he'd be very popular with that group.


I've heard 25-50 usually per inch. At 150fps per inch, going from 24" down to 16 would be a loss of 1200 fps.


The only way I know someone would figure 100-150fps loss is by dividing the velocity by barrel length (2800fps/24in). Its wrong but gets close to the numbers.

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