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Mar 25th, 2012
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Shorter Barrel = Faster speed #7164159
05/08/18 09:18 PM
05/08/18 09:18 PM
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Scott W Offline OP
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Saw this video today about the Tikka TAC A1 and at the 1:55 mark he talks about not getting the speed out of Tikka's 24" barrel so he put a 22" Bartlien barrel on it and gains 115 fps.

How does the same ammo produce a faster speed out of a shorter barrel made by a different manufacturer?

https://www.youtube.com/watch?v=shqciW9BgSo

Re: Shorter Barrel = Faster speed [Re: Scott W] #7164160
05/08/18 09:19 PM
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Re: Shorter Barrel = Faster speed [Re: Scott W] #7164161
05/08/18 09:21 PM
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Originally Posted By: Scott W
Saw this video today about the Tikka TAC A1 and at the 1:55 mark he talks about not getting the speed out of Tikka's 24" barrel so he put a 22" Bartlien barrel on it and gains 115 fps.

How does the same ammo produce a faster speed out of a shorter barrel made by a different manufacturer?

https://www.youtube.com/watch?v=shqciW9BgSo



Every barrel is unique and produces difference results.

Re: Shorter Barrel = Faster speed [Re: Scott W] #7164165
05/08/18 09:27 PM
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I'm gonna make an educated guess.

Cut rifled verus button rifled.

What was the twist rate of each? A more agressive twist can reduce velocity.

Did each barrel have the same round count? At least, were both north of 250 rounds, which is where most 6.5mm settle in.



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Re: Shorter Barrel = Faster speed [Re: Scott W] #7164168
05/08/18 09:31 PM
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Could also be due to the chamber.


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Re: Shorter Barrel = Faster speed [Re: Scott W] #7164169
05/08/18 09:31 PM
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Originally Posted By: Scott W


How does the same ammo produce a faster speed out of a shorter barrel made by a different manufacturer?



Tighter bore, which creates more pressure.

Re: Shorter Barrel = Faster speed [Re: jeffbird] #7164200
05/08/18 09:58 PM
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Originally Posted By: jeffbird
Originally Posted By: Scott W


How does the same ammo produce a faster speed out of a shorter barrel made by a different manufacturer?



Tighter bore, which creates more pressure.


this^^^ is most likely the answer... just watched the video there are tons of difference between those barrels

Last edited by SingleShot85; 05/08/18 10:07 PM.
Re: Shorter Barrel = Faster speed [Re: Scott W] #7164210
05/08/18 10:03 PM
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Custom vs mass produced barrel? Even though Tikka/Sako are about the best when it comes to factory barrels.


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Re: Shorter Barrel = Faster speed [Re: booradley] #7164245
05/08/18 10:29 PM
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Originally Posted By: booradley
Even though Tikka/Sako are about the best when it comes to factory barrels.


loser8

Re: Shorter Barrel = Faster speed [Re: jeffbird] #7164251
05/08/18 10:35 PM
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Originally Posted By: FiremanJG
I'm gonna make an educated guess.
Cut rifled verus button rifled.


Nope. Not a factor in and of itself.


Originally Posted By: jeffbird

Tighter bore, which creates more pressure.



Correct.

Actually the Tikka CTR barrels are pretty widely known to be on the slow side. They shoot like lasers, but tend to give up some velocity.

Re: Shorter Barrel = Faster speed [Re: snarkscarbine] #7164294
05/08/18 11:13 PM
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Originally Posted By: snarkscarbine
Originally Posted By: FiremanJG
I'm gonna make an educated guess.
Cut rifled verus button rifled.


Nope. Not a factor in and of itself.


Have you seen the tool chatter inside both before?



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Re: Shorter Barrel = Faster speed [Re: Scott W] #7164303
05/08/18 11:22 PM
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I didn't watch the video (blocked here at work) generally speaking a shorter barrel will not yield faster speed. There are other factors...my first two guesses without knowing anything about the issue is 1 - tighter bore as mentioned above...item that popped in my head initially that wasn't mentioned is freebore will effect pressure/speed/etc.


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Re: Shorter Barrel = Faster speed [Re: Scott W] #7164324
05/08/18 11:34 PM
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One of them is a Bartlein, and one of them is not. That’s how.

I have a feeling that researching the gain LH twist thing would make my brain hurt.

Last edited by Crews; 05/09/18 12:20 AM.
Re: Shorter Barrel = Faster speed [Re: Crews] #7164406
05/09/18 12:26 AM
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Originally Posted By: Crews
One of them is a Bartlein, and one of them is not. That’s how.


^^^Agree^^^ any factory barrel settled in or not can't compare to a Bartlein, two different animals. It's not worth breaking out the measuring tape, that's why I cringe when someone starts talking about brand X is just as accurate as any semi custom or fully custom rifle thats custom chambered by a reputable smith. The only way to get precision accuracy is to have a precision rifle built then develop a custom hand load.

Re: Shorter Barrel = Faster speed [Re: Scott W] #7164438
05/09/18 12:50 AM
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So if it was pressure then the 24 inch could have been loaded to match or exceed the speed of the shorter barrel.... only makes sense.


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Re: Shorter Barrel = Faster speed [Re: redchevy] #7164480
05/09/18 01:27 AM
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Originally Posted By: redchevy
Could also be due to the chamber.


^
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|
|


This for sure.


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Re: Shorter Barrel = Faster speed [Re: FiremanJG] #7164508
05/09/18 01:43 AM
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Originally Posted By: FiremanJG
Originally Posted By: snarkscarbine
Originally Posted By: FiremanJG
I'm gonna make an educated guess.
Cut rifled verus button rifled.


Nope. Not a factor in and of itself.


Have you seen the tool chatter inside both before?


Idk about tool marks but there are some serious shooters/builders over in the benchrest world that swear Broughton button barrels are faster than most other custom barrels.


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Re: Shorter Barrel = Faster speed [Re: jeffbird] #7164516
05/09/18 01:47 AM
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Originally Posted By: jeffbird
Originally Posted By: Scott W


How does the same ammo produce a faster speed out of a shorter barrel made by a different manufacturer?



Tighter bore, which creates more pressure.


Was going to be my thoughts as well.

Re: Shorter Barrel = Faster speed [Re: Scott W] #7164535
05/09/18 02:02 AM
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Lots of things come into play when talking rifle to rifle, barrel to barrel. Chamber size, throat length, barrel diameter and consistancy, type of rifling, smoothness of bore, land and groove style depth etc. That is not a complete list. We are quessing and so is anyone else that says they have the for sure truth of cases like this.

Re: Shorter Barrel = Faster speed [Re: Scott W] #7164605
05/09/18 03:20 AM
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Thanks for all the responses and education. I done learned something today!

Tighter chamber of a custom barrel makes sense as well as the smoothness of the bore. Didn't realize barrels would gain speed as they settle in.

Re: Shorter Barrel = Faster speed [Re: dee] #7164611
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Originally Posted By: dee
Originally Posted By: FiremanJG
Originally Posted By: snarkscarbine
Originally Posted By: FiremanJG
I'm gonna make an educated guess.
Cut rifled verus button rifled.


Nope. Not a factor in and of itself.


Have you seen the tool chatter inside both before?


Idk about tool marks but there are some serious shooters/builders over in the benchrest world that swear Broughton button barrels are faster than most other custom barrels.


^^yep^^ Broughton's are known/said to be faster I don't have one but I know two smiths that have built and re-barreled alot of rifles and both say the same about Broughton barrels.

Re: Shorter Barrel = Faster speed [Re: Scott W] #7165140
05/09/18 07:54 PM
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I know, I know! They oiled the barrel on the 22 incher! Yeah, that's it - less friction.


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Re: Shorter Barrel = Faster speed [Re: FiremanJG] #7167014
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Originally Posted By: FiremanJG
Originally Posted By: snarkscarbine
Originally Posted By: FiremanJG
I'm gonna make an educated guess.
Cut rifled verus button rifled.


Nope. Not a factor in and of itself.


Have you seen the tool chatter inside both before?


Yep. If you do it right there is none. I've borescoped a pretty decent number of Hardys, and they're some of the most perfect bores you will ever see.

Last edited by snarkscarbine; 05/11/18 05:01 PM.
Re: Shorter Barrel = Faster speed [Re: snarkscarbine] #7167039
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Originally Posted By: snarkscarbine
Originally Posted By: FiremanJG
Originally Posted By: snarkscarbine
Originally Posted By: FiremanJG
I'm gonna make an educated guess.
Cut rifled verus button rifled.


Nope. Not a factor in and of itself.


Have you seen the tool chatter inside both before?


Yep. If you do it right there is none. I've borescoped a pretty decent number of Hardys, and they're some of the most perfect bores you will ever see.


How bout a Remington, Tikka, or Savage? Worse I ever saw was on a friend's Thompson Encore. It could be seen with the naked eye.



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Re: Shorter Barrel = Faster speed [Re: Scott W] #7167045
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Originally Posted By: FiremanJG

How bout a Remington, Tikka, or Savage? Worse I ever saw was on a friend's Thompson Encore. It could be seen with the naked eye.


Yeah, I believe that. My point was more that Button vs Cut doesn't make that difference in and of itself. Doing it properly does.

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