Author Topic: Optimum barrel length for 308  (Read 1949 times)

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Offline longwinters

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Optimum barrel length for 308
« on: April 21, 2005, 10:26:37 AM »
What is the most efficient/optimum barrel length for the 308 caliber.  

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Offline Ramrod

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Optimum barrel length for 308
« Reply #1 on: April 21, 2005, 12:24:25 PM »
As you probably know, as case capacity increases,(relative to bore size), barrel length needs to increase also, in order to burn all the powder. The reverse is also true. .300 Mags do best with 26 inch barrels, and in the .30-06 a 24 incher is about right, even though many lightweight guns have 22 inch barrels. So I would think a 22 inch is perfect for a .308 Win, but a 20 would be almost as good.
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Offline Redhawk1

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Optimum barrel length for 308
« Reply #2 on: April 21, 2005, 12:34:36 PM »
I would go with a 22 or 24 inch barrel for the 308.  :D
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Offline roper

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Optimum barrel length for 308
« Reply #3 on: April 21, 2005, 01:21:48 PM »
If it's a hunting type barrel 22" would be good my varmit custom tight neck 308 has a 24".  I also shot a 26" barrel one for awhile.  Well good luck.  Tom Holland

Offline jro45

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Optimum barrel length for 308
« Reply #4 on: April 22, 2005, 05:33:55 AM »
I have a 26" barrel on my 30/06 so I see nothing wrong with a 26" barrel on the 308. Just gives the powder a longer chance to burn up= faster bullet.

Offline Lawdog

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Optimum barrel length for 308
« Reply #5 on: April 23, 2005, 12:16:58 PM »
I wouldn't go less than 24" myself.  A 22" barrel is OK but anything shorter starts cutting into what type of powders you can use when reloading.  Lawdog
 :D
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Offline rickt300

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Optimum barrel length for 308
« Reply #6 on: April 24, 2005, 12:48:30 PM »
Depends on what you want out of optimum. My latest treestand rifle is a 22 inch barreled 308 on a Mauser action.  A very light contour and overall a light rifle. My last 308 had a 20 inch barrel and I had nothing to complain of except it was a very heavy contour and did not balance well. Both rifle shoot very well.
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Offline kombi1976

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Optimum barrel length for 308
« Reply #7 on: April 27, 2005, 03:18:31 PM »
It's a very open question really.
To make the most of a .308's powder and minimise muzzle flash and noise 24" is probably the best bet.
But in some situations that's impractical to have a barrel that long.
Why do you want to know this?
Are you building a rifle or rebarreling an existing rifle?
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Offline longwinters

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Optimum barrel length for 308
« Reply #8 on: April 27, 2005, 03:58:49 PM »
I see in the reloading manuals that most test with a 24" barrel (for the 308).  Yet most rifles I see have 20-22" barrels.  Actually I see this in many calibers not just 308.  I understand for woods hunting a 22" or less is easier to use, while out west a 24" would be good for more wide open and or longer shots.  Just curious what the most efficient barrel length would be.

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Offline targetguy

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Optimum barrel length for 308
« Reply #9 on: June 13, 2005, 06:01:48 PM »
In the new speer reloading manual, they said that they got higher velocites with a 22" barrel than with a 24" barrel.  I like the 20 inch myself because they are so handy.

Offline sniperVLS

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Optimum barrel length for 308
« Reply #10 on: June 14, 2005, 09:24:59 PM »
I must be the odd man out. All my rifles have 26" barrels.

Picking up a 700 Sendero SF .300 win mag soon and that will be yet another heavy, 26" varmint barrel added to the safe.

Out of all my babies, my Rem 700 VLS .308 is my favorite. I had a Rem 700 Mountain Rifle .30-06 for years, and having the VLS weigh 4 to 5 lbs more doesnt bother me one bit, either does the much longer barrel.

I remember testing loads with my Uncle many years ago and if my memory serves me right, with "most" calibers tested, the 22" gave us faster speeds.

Offline kombi1976

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Optimum barrel length for 308
« Reply #11 on: June 14, 2005, 09:40:13 PM »
Gotta admit, there's nothing cooler than a long barrel and it certainly will help so long as you don't mind lugging it. :grin:
I even considered building a rifle with a really short butt and a long fore arm to keep the OAL short with a long barrel.
It would involve altering my grip technique but it would be an interesting project. :-)
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.22lr ~ 22 Hornet ~ 25-20 ~ 303/25 ~ 7mm-08 ~ 303 British ~ 310 Cadet ~ 9.3x62 ~ 450/400 NE 3"

Offline Lawdog

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Optimum barrel length for 308
« Reply #12 on: June 15, 2005, 09:17:51 AM »
Quote
Gotta admit, there's nothing cooler than a long barrel and it certainly will help so long as you don't mind lugging it.


I hear shooters say this all the time which makes me wonder just exactly how much does 2 inches(the difference between a 24” and a 22” barrel) of a sporting weight .308 caliber barrel weight?  Or for that matter 4 inches?  I would be interested in knowing just how much these two lengths weight.  Lawdog
 :D
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Offline jdt48653

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Optimum barrel length for 308
« Reply #13 on: June 15, 2005, 01:24:18 PM »
about the same weight as 1/2 guiness,or 3/4 of a miller light!

Offline 147 Grain

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Optimum barrel length for 308
« Reply #14 on: June 16, 2005, 07:59:00 AM »
FYI:

Most of the Remington 700 rifles now have 24" barrels, as evidenced by their entry level SPS synthetic line, which replaced the ADL.  SPS Stainless rifles have replaced the BDL stainless.

I just bought a 30-06 SPS Stainless for my son and we love how it shoots (weight is 7 3/8 lbs).  308 Win is also offered with a 24" tube and weight is 7 1/4 lbs.
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Offline cal sibley

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Optimum barrel length for 308
« Reply #15 on: July 15, 2005, 04:58:24 PM »
Nearly all the .308Win.s I've encountered have 22" barrels.  I guess it's considered ideal.  In a target rifle I might prefer a 24" tube, but that's just me.  Best wishes.

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Offline kombi1976

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Optimum barrel length for 308
« Reply #16 on: July 16, 2005, 09:52:36 PM »
Quote from: cal sibley
Nearly all the .308Win.s I've encountered have 22" barrels.  I guess it's considered ideal.

I prescribe to Lawdog's theory.
It's a bit like recoil really.
Recoil is, in the end, a felt effect and so what is considered as quite reasonable by one person is uncomfortable for another.
In the same way there is a deep seated feeling with some people that the extra 2" or 4" will somehow be that much more unweildy in the forest/on the mountain/etc., not to discount the fact that carbines are much more appropriate in some situations.
However, my thoughts on the commonality of 22" barrels is different.
I rarely find that "ideal", at least in a performance/user sense, enters into any common feature or dimension on a mass produced product.
Instead, it is usually marketed that way to the public or produced for some economic manufacturing reason(i.e. 10 can be made out of a certain length of billet instead of 8 and a bit).
If a giant in the industry like the Big "R" or the Slightly-less-big "W" then sticks to this it becomes an industry standard and other companies follow in order to compete and provide a point of comparison for their products.
I don't deny that 22" is a suitable barrel length to get good performance from the .308 Win but I'm not counting the above suggested brands to establish what is the optimum, especially considering the Big "R"'s recent record on market response. :roll:
Then again, I may be wrong. :wink:
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.22lr ~ 22 Hornet ~ 25-20 ~ 303/25 ~ 7mm-08 ~ 303 British ~ 310 Cadet ~ 9.3x62 ~ 450/400 NE 3"

Offline Lone Star

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Optimum barrel length for 308
« Reply #17 on: July 17, 2005, 04:39:07 AM »
How about facts rather than just opinions?   In each test below the original .308 WCF barrel was cut back between each series of chronographed shots.

G&A, 7/89:
Hornady 165 ammo
22" = 2674 fps
21" = 2636
20" = 2617
19" = 2595

G&A, 9/87:
180-grain handload with IMR4320 and IMR4198
Length...4320...4198
24"........2700...2450 fps
22"........2650...2425
20"........2620...2380
18"........2550...2340
16"........2480...2280
14"........2400...2225
12"........2300...2150
10"........2175...2240

For a .30-06 -
G&A 11/81:
165-grain with W760
26" = 2896 fps
24" = 2850
22" = 2820
20" = 2772

From all the examples it is clear that the velocity loss going down to a 20" barrel is so small it would never be noticed in the field.  Different brands of ammo can vary as much.

Offline kombi1976

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Optimum barrel length for 308
« Reply #18 on: July 17, 2005, 05:50:27 PM »
So what it's showing is that the difference between 24" and 20" is about 80fps.
Sad to say, though, Lone Star, but opinion always comes into it, at least as far as preferences. :wink:
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.22lr ~ 22 Hornet ~ 25-20 ~ 303/25 ~ 7mm-08 ~ 303 British ~ 310 Cadet ~ 9.3x62 ~ 450/400 NE 3"

Offline Lone Star

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Optimum barrel length for 308
« Reply #19 on: July 18, 2005, 12:44:24 AM »
Quote
Sad to say, though, Lone Star, but opinion always comes into it, at least as far as preferences. :wink:
Sorry to hear that you are sad, perhaps a bottle of bubbly will help.   :wink:   My comment was certainly not meant to squelch opinion - but there were virtully no facts being persented in this thread, and it was time for some.  Remember that the original poster asked for the most efficient/optimum barrel length, but he mostly got personal opinions on use.  Now he can make an informed decision based on facts, not just other people's personal preferences. :D

Offline nomosendero

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Optimum barrel length for 308
« Reply #20 on: July 18, 2005, 02:14:21 AM »
Lone Star
Thanks for the info!
Real numbers come in handy sometimes. This shows how the 20" Rem.
Light Tactical & the 20" Savage make alot of sense. If you are loading
the 175SMK or similar match bullets & shooting long range competition
of course you need to get all the velocity you can. Hotter loads will show a
little more spread than you chart, but not much. The .308 case has a
modest powder capacity relative to the bore dia. So for normal loads &
normal ranges, as your chart shows, the 20" looks very good indeed!
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Offline kombi1976

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Optimum barrel length for 308
« Reply #21 on: July 18, 2005, 02:51:34 AM »
Darn it....always lettin' facts get in the way of a good ol' fashioned debate!! :evil:   :) :mrgreen:
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.22lr ~ 22 Hornet ~ 25-20 ~ 303/25 ~ 7mm-08 ~ 303 British ~ 310 Cadet ~ 9.3x62 ~ 450/400 NE 3"

Offline longwinters

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Optimum barrel length for 308
« Reply #22 on: July 18, 2005, 11:44:10 AM »
Thanks for the info.

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