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#493432 - 11/14/07 02:45 PM Most accurate round...with 20" barrel?
Goat-roper
Spike


Registered: 11/13/03
Posts: 84
Loc: Mossy Creek

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Okay, gunslingers, gnat-knockers, brass-packers....I've seen lots of targets on here, heard lots of data, but I haven't heard your opinion on what you think is the most accurate round out of a "carbine" or short barrel. Chime in.
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#493434 - 11/14/07 02:47 PM Re: Most accurate round...with 20" barrel? [Re: Goat-roper]
smstone22
16 Point


Registered: 01/11/04
Posts: 16862
Loc: Allardt, TN

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hmmm let me think about this.....I dont have a clue. I dont know why a shorter barrel would change anything as far as which calibers. Most often it is not the caliber that defines accuracy, it is the weapon and how it is made.
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#493503 - 11/14/07 03:56 PM Re: Most accurate round...with 20" barrel? [Re: ]
megalomaniac
12 Point


Registered: 10/28/05
Posts: 5051
Loc: Mississippi

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All rifles will be more accurate with a shorter barrel over a longer barrel (all other things being equal).

That being said, what you are looking for is a caliber which is capable of using case capacity (ie burning the powder) in a short barrel.

All the .308 family (.243, .260, 7-08, .308) are quite accurate and are still quite efficient even with a 20" barrel.

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#493533 - 11/14/07 04:10 PM Re: Most accurate round...with 20" barrel? [Re: megalomaniac]
smstone22
16 Point


Registered: 01/11/04
Posts: 16862
Loc: Allardt, TN

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Why would you think a rifle would be more accurate with a shorter barrel?????
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#493534 - 11/14/07 04:11 PM Re: Most accurate round...with 20" barrel? [Re: megalomaniac]
4onaside
12 Point


Registered: 02/07/06
Posts: 5105
Loc: Jackson,Tn

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 Originally Posted By: megalomaniac
All rifles will be more accurate with a shorter barrel over a longer barrel (all other things being equal).

That being said, what you are looking for is a caliber which is capable of using case capacity (ie burning the powder) in a short barrel.

All the .308 family (.243, .260, 7-08, .308) are quite accurate and are still quite efficient even with a 20" barrel.
I realize that my response does not address the specific question asked by Goat-roper, but they are more "efficient" in a 22", 24" or most of all a 26" barrel. For every inch that you chop off from 26", you lose quite a few fps(velocity), which in turn gets back to the efficiency of a round, doesn't it?
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#493545 - 11/14/07 04:18 PM Re: Most accurate round...with 20" barrel? [Re: 4onaside]
smstone22
16 Point


Registered: 01/11/04
Posts: 16862
Loc: Allardt, TN

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you are correct 4onaside. If you really want a long range rifle your talking around a 30 inch barrel.
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#493571 - 11/14/07 04:38 PM Re: Most accurate round...with 20" barrel? [Re: smstone22]
4onaside
12 Point


Registered: 02/07/06
Posts: 5105
Loc: Jackson,Tn

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 Originally Posted By: steven stone
you are correct 4onaside. If you really want a long range rifle your talking around a 30 inch barrel.
I realize that anything beyond 26" inches becomes impractical from a handling standpoint(although I once owned a model 95 chilean mauser that had a 29" barrel, which I cut off to a more practical length). Most all of your ballistics tables use 26" barrels to arrive at their figures. I own two 26"rs, one of which I just bought for my next year's(hopefully, LOL) prarie goat hunt. However, at the ranges that most of us shoot for whitetails all of this is really immaterial, 18, 20, 26, or whatever.
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#493677 - 11/14/07 06:05 PM Re: Most accurate round...with 20" barrel? [Re: 4onaside]
megalomaniac
12 Point


Registered: 10/28/05
Posts: 5051
Loc: Mississippi

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Steven,

shorter barrels are more inherently accurate because they are stiffer. Same reason a #8 contour is more accurate than a #2 contour. Less barrel vibration as the bullet travels through the bore.

Again, this is all other variables being equal.

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#493688 - 11/14/07 06:15 PM Re: Most accurate round...with 20" barrel? [Re: 4onaside]
megalomaniac
12 Point


Registered: 10/28/05
Posts: 5051
Loc: Mississippi

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 Originally Posted By: 4onaside
 Originally Posted By: megalomaniac
All rifles will be more accurate with a shorter barrel over a longer barrel (all other things being equal).

That being said, what you are looking for is a caliber which is capable of using case capacity (ie burning the powder) in a short barrel.

All the .308 family (.243, .260, 7-08, .308) are quite accurate and are still quite efficient even with a 20" barrel.
I realize that my response does not address the specific question asked by Goat-roper, but they are more "efficient" in a 22", 24" or most of all a 26" barrel. For every inch that you chop off from 26", you lose quite a few fps(velocity), which in turn gets back to the efficiency of a round, doesn't it?


Ahh, that's the rub...

ALL cartridges will lose velocity as you shorten the barrel. BUT, some cartridges will experience a disproportionate drop in velocity with barrel shortening compared to other cartridges. Thus the 'efficiency' concept. The .308 family will retain a larger percentage of its original velocity when chopped from 26 to 20 inches over much larger cases. Although the larger cases will still be travelling faster than the 308 at 20", they will have lost disproportionately more velocity.

The concept of lengthening the barrel is similar as well. Most cartridges have an optimum barrel length, and going beyond that the gains in fps/inch of barrel begin to diminsh significantly. Most hunting cartridges operate at most efficient (velocity versus the inconvenience and decreased accuracy of a longer barrel) lengths of 24-26". Exceptions are the ultramags which operate at maximum efficiency of barrel lengths of 28-30"

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#493705 - 11/14/07 06:23 PM Re: Most accurate round...with 20" barrel? [Re: megalomaniac]
megalomaniac
12 Point


Registered: 10/28/05
Posts: 5051
Loc: Mississippi

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Here's some real numbers, although different barrels:

15" encore pistol 7mm-08 140gr BT, 47g re 19......2500 fps
22" rem 700 7mm-08 140gr BT, 47g re 19......2725 fps

I forget where I saw it, but there's a chart on the web where a fellow actually started with a 26" barrel and cut it off at 2" increments and recorded the velocity after each shortening job. If I recall, he ended up with around 25 fps/inch decrease in velocity with that particular cartridge.

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