OzFclass

the1/13 twist used by most 308 shooters was established as optimum for the old 155 gn palma bullet.
it is known that this bullet gives better accuracy at closer ranges with a slower twist, 13" being optimum for palma ranges at about 2950 to 3000 fps.
the newer sierra and the dyer are i think longer than the old sierra.
does this mean that a slightly faster twist, maybe 12.5" or even 12" would suit the longs, with maybe a 14"' twist would be better at the shorts.
knowing that minimum necessary stablization promotes accuracy and improves b.c., could it be worth the modern fstd shooter running a 308 switchbarrel with two twists.
some of these shooters and guns are getting pretty good now. it would be interesting to know.
bruce moulds.

Bruce,

There have been more than one well-credentialled TR shooter running the HBCs with 10 twist barrels & quite a number with 12 twist.

I suspect that it's getting into angels on a pinhead to worry about twist too much.

On the other hand, I'm coming to the opinion that mosts barrels are too tight. I'm currently using a Maddco because his was the largest bore I could get when I replaced my 300/308 Kreiger that's still at the attention ready to go back into service after 4800 rounds of sub ½MOA work.

John