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Old February 28, 2013, 08:21 PM   #10
Bart B.
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Join Date: February 15, 2009
Posts: 4,989
Dan, thanks for the link to that test. I've been predicting those results for the .308 Win. for over 30 years.

It pretty much confirms my being told by lots of top competitors, they don't want to take a .308 Win. match rifle to the Nationals with more than 1,500 rounds through it. And it helps explain why Sierra Bullets rebarrels their 30 caliber bullet test barrel chambered for the .308 Win. at 3000 rounds.

Regarding the following table from the link, I think (hope?) the group sizes are averages for 3 shots:

# OF
RNDS ______ 3-SHOTS
1000 _______ 0.288
2000 _______ 0.206
3000 _______ 0.349
4000 _______ 0.408
5000 _______ 0.200
6000 _______ 0.553
7000 _______ 0.444
8000 _______ 0.541
9000 _______ 0.636
10,000 _____ 0.713

It's interesting that the 2000 and 5000 round group's smaller than the 1000 round one. That sort of contradicts reality in my experience. Those other dips in group size, as well as these, may be due to variables in the ammo, too. But it shows that barrels degrade in accuracy; one chooses their own limits of acceptable accuracy.
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