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#5403667 - 11/06/14 05:08 PM .308 barrel length
wp75169 Offline
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Registered: 10/11/09
Posts: 3871
Loc: Wills Point
I sold my two primary guns to build a LH Tikka. Bought the tikka yesterday. As It sets its a .308 with a 22.xx" barrel. Using my wife's 7-08 now with the the same barrel length. I hate it. I got used to the 20-19" rifles I was using.

How much would I lose cutting it to 18" on the new .308. 100-150fps? If that's all that's fine. Less whip and more maneuverable is what I'm looking for.

Will later change the bolt stop and mag and rebarrel to 6.5-06 at 20" but fo now going to cut this beast down.

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#5403708 - 11/06/14 05:31 PM Re: .308 barrel length [Re: wp75169]
dee Online   content
Extreme Tracker

Registered: 04/10/10
Posts: 4665
Loc: Red River way
Rule of thumb is typically 50fps per inch.
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#5403711 - 11/06/14 05:33 PM Re: .308 barrel length [Re: wp75169]
daniel1381 Offline
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Registered: 03/07/12
Posts: 3503
Loc: longview texas
Had my tikka 6.5x55 cut to 16.25.
Going to range soon to find out how it does



Edited by daniel1381 (11/06/14 05:34 PM)
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#5403735 - 11/06/14 05:51 PM Re: .308 barrel length [Re: dee]
FiremanJG Offline
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Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
Originally Posted By: dee
Rule of thumb is typically 50fps per inch.


You sure about the number?
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#5403764 - 11/06/14 06:06 PM Re: .308 barrel length [Re: FiremanJG]
wp75169 Offline
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Registered: 10/11/09
Posts: 3871
Loc: Wills Point
Originally Posted By: FiremanJG
Originally Posted By: dee
Rule of thumb is typically 50fps per inch.


You sure about the number?


I'm thinking/hoping 25'

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#5403843 - 11/06/14 06:48 PM Re: .308 barrel length [Re: FiremanJG]
dee Online   content
Extreme Tracker

Registered: 04/10/10
Posts: 4665
Loc: Red River way
Originally Posted By: FiremanJG
Originally Posted By: dee
Rule of thumb is typically 50fps per inch.


You sure about the number?


That's what I've always been told.
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#5403848 - 11/06/14 06:52 PM Re: .308 barrel length [Re: wp75169]
ccoker Online   content
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Registered: 09/17/09
Posts: 3319
My experince with 308 is closer to 20
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#5403881 - 11/06/14 07:15 PM Re: .308 barrel length [Re: ccoker]
FiremanJG Offline
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Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
Originally Posted By: ccoker
My experince with 308 is closer to 20



Yes. And 7-08, and the short action 6.5's
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#5404025 - 11/06/14 08:36 PM Re: .308 barrel length [Re: dee]
ChadTRG42 Online   happy
THF Trophy Hunter

Registered: 09/16/09
Posts: 9425
Loc: Lewisville, TX
Typically, you lose about 15-20 fps per inch, which will be the case for a 308 shooting the 150 to 180 grain bullets. But it depends on what the caliber is and how light of a bullet. If you are running a magnum round with a very light bullet that's running 3500 fps, you will lose/gain more, for obvious reasons. But with your common calibers and bullet weights, it's about 20 fps per inch.

Originally Posted By: dee
Rule of thumb is typically 50fps per inch.


^^^ That's incorrect.
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#5404796 - 11/07/14 09:08 AM Re: .308 barrel length [Re: wp75169]
dee Online   content
Extreme Tracker

Registered: 04/10/10
Posts: 4665
Loc: Red River way
I always say 50 or less there are too may variables to guarantee one or the other.
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#5405447 - 11/07/14 01:45 PM Re: .308 barrel length [Re: wp75169]
SingleShot85 Offline


Registered: 05/27/09
Posts: 1750
Loc: S.A. and Kinney Co.
This one is 18" and I'm getting 2600fps w/ a 175smk

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#5408723 - 11/09/14 02:36 PM Re: .308 barrel length [Re: wp75169]
RickC. Offline
Light Foot

Registered: 08/26/14
Posts: 24
Loc: Euless, TX
I have 3 .308s, barrel lengths are 24", 22" and 18 1/2". Forget the 50 fps/inch, I have not seen that to be the case. With two different 165 grain loads, I measured the difference in velocity between the 24 and the 18.5 to be exactly 168 fps-- and that is a difference of five and half inches.

If I followed you correctly, you're going from 22" to 18"? I wouldn't worry about it. Sight it in, hunt with it, and don't think another thing about it if the accuracy suits you. I have killed a bunch of deer over the years with my Rem 788 with an 18.5" barrel.


Rick
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#5409020 - 11/09/14 05:18 PM Re: .308 barrel length [Re: RickC.]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6220
Loc: Wise Co.
Originally Posted By: RickC.
...I measured the difference in velocity between the 24 and the 18.5 to be exactly 168 fps-- and that is a difference of five and half inches.


That figures to be about 30 fps per inch of barrel. Chad has seen 20 fps per inch of barrel for .308, typically. That just shows that all barrels are different and you can't nail it down, only come up with an approximation. The cartridge makes a difference also.
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#5409139 - 11/09/14 06:13 PM Re: .308 barrel length [Re: wp75169]
KRoyal Online   sleepy
THF Celebrity

Registered: 01/24/07
Posts: 13627
Loc: Sherman/North of Dallas
I shoot 168gr AMax from Chad and it is chrono'd by him at 2630fps out of his 22" barrel and chrono'd at 2490-2510 out of my 16" barrel. This is a lose of about 23 +\- a few fps per inch. My 16" barrel still stabilized the bullet out to 800 yards for sure probably further just haven't had a chance to shoot further than that. I'd never own a long barreled 308 again lol no use in it.
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#5410198 - 11/10/14 09:06 AM Re: .308 barrel length [Re: RickC.]
ChadTRG42 Online   happy
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Registered: 09/16/09
Posts: 9425
Loc: Lewisville, TX
Originally Posted By: RickC.
I have 3 .308s, barrel lengths are 24", 22" and 18 1/2". Forget the 50 fps/inch, I have not seen that to be the case. With two different 165 grain loads, I measured the difference in velocity between the 24 and the 18.5 to be exactly 168 fps-- and that is a difference of five and half inches.


You can easily get velocity variation from the same length barrel in 2 different rifles with the same load. So, it's not a 100% accurate method to know exactly what the difference is when using different rifles, especially with different 165 grain loads.
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