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7mm-08 barrel length

 
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  #1  
Old 08-23-2008, 03:26 PM
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Location: McChord AFB
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7mm-08 barrel length

I did a search, but for some reason it doesn't like it when you type things like 7-08 or 7mm-08 or 25-06 in the search block.

I'm pretty familiar with barrel lengths for a .308 Winchester, but not on the 7mm-08. I'm wanting to build a Savage light hunting rilfe with a barrel in the 20-24" range, in a varmint contour (muzzle dia beween .8 and .85"). This rifle would typically be used for White Tail, Mullies, Coyote/Predators, and target shooting. Eleveation will vary between sea level and 5,000ft. What barrel length is typically optimal for the 7mm-08? I'm hoping to use bullets in the 130gr

And since I'm here, what about a similar set-up in .25-06 (barrel length)? If given the choice between the .25-06 or 7mm-08, which would you chose and why?
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  #2  
Old 08-23-2008, 04:46 PM
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Join Date: May 2008
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Posts: 151
Re: 7mm-08 barrel length

For the 7mm-08 a 22 inch barrel should be sufficient to get complete powder burn. I might bump it up to 24 inches for the 25-06. As for which I would choose. That is tough. I like the bullet selection of both buy what can I say, I'm a 7mm guy at heart. So the 7mm would have to get my vote.
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  #3  
Old 08-23-2008, 05:16 PM
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Re: 7mm-08 barrel length

You wouldn't happen to have a link or matrix regarding the velocity of a 7mm-08 at 20, 22, and 24" would you?

Thanks!
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  #4  
Old 08-23-2008, 05:22 PM
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Re: 7mm-08 barrel length

Sorry mate no such luck. 7mm-08 is a necked down 308. 308 easily achieves complete powder burn out of 22 inch barrel thus the same should hold true to 7mm-08. As for velocity a longer barrel doesn't necessarily translate to velocity. You will only gain velocity so long as the powder behind the bullet is burning and the gas is expanding. Thus once the powder is burned it is time to get that bullet out of the barrel.
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  #5  
Old 08-23-2008, 05:28 PM
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Re: 7mm-08 barrel length

Quote:
Originally Posted by Longshot38 View Post
Sorry mate no such luck. 7mm-08 is a necked down 308. 308 easily achieves complete powder burn out of 22 inch barrel thus the same should hold true to 7mm-08. As for velocity a longer barrel doesn't necessarily translate to velocity. You will only gain velocity so long as the powder behind the bullet is burning and the gas is expanding. Thus once the powder is burned it is time to get that bullet out of the barrel.

This I know (I've read the Tac-Ops article numerous times for starters;), I was just curious what the velocities looked like from a 7mm-08 at various barrel lengths.

Thanks

BTW, do you use this name on all forums? I recognize it from the SC and SAS.
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  #6  
Old 08-23-2008, 06:06 PM
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Re: 7mm-08 barrel length

Quote:
Originally Posted by ogre View Post
You wouldn't happen to have a link or matrix regarding the velocity of a 7mm-08 at 20, 22, and 24" would you?

Thanks!

I have the real thing and will share my experiences and some load data.

I started with a factory barrel (18.5 in in length).
Tried 140gr bullets,velocity was under 2800 ft/sec.

Had the barrel changed to 20'' and picked up around 75 ft/sec Still a little slow
for what I wanted.

Switched to 120gr Ballistic Tips and that did the trick.

Velocity increased to 3010 ft/sec with 49.5 grs H-414 and deer fell where they
were shot.

This ended up being one of my favorite rifles.

The barrel is a 20''#7 taper shilen select match on a model 7 action and a AI
laminated stock.

Best group to date .053 5 shot @ 100yrds.

A friend of mine has one with a 22'' barrel and only gets 25 to 30 ft/sec more
so it appears 20'' to 22'' of barrel is optimum.

With the short action and a 20'' barrel this is a very handy (short) rifle and a
very good running deer/hog rifle .

I have taken game over 500yrds with it and would not be afraid to shoot targets
to 600 yards with this combo.

For longer distance I would increase bullet weight to the 150gr bullets.

As for the 25/06 it would need a long action and 24'' to 26'' barrel with no
improvement in velocity with a 120gr bullet (About The largest bullet in .257).

J E CUSTOM
__________________
"PRESS ON"
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  #7  
Old 08-23-2008, 07:05 PM
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Re: 7mm-08 barrel length

Wow, great info! Thanks!
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