Originally Posted by SteveAreno
308 will burn gas that long? I was thinking 24inch. Any idea what kind of velocity you have at 1000 with a 168gr boat tail from a 26inch?
Depending on the load I used My hottest load with a 168 gr SMK was just over 2800 ft/sec
in a 27.5" barrel. this was a match rifle and was used for 200,300,600,900,1000 and 1100
The gain from 24" to 26" is not as much as 20 to 22'' but it is enough to make a difference
@ 1000 yards.
Rifles with 22 and 24'' barrels were 150 to 250 ft/sec slower than the 27.5" barrel using the 168s.
My 1000 yard velocity was just over 1400 ft/sec with a tough load.
I am not sure how much barrel would be needed before the 308 had no velocity gain but
there is a point of diminishing returns and 28'' seems to be near that point.
Also different barrels of the same length may vary some in velocity (Some are faster than
others) So what you have to decide is what length will best fit your needs and then live with
the velocity you can get.
As long as it stays above subsonic you should be OK. 26 to 28" barrels should do that at 1000+
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