if your going to shoot a 30-06 or .300 win. mag. out past 300 you will want a 165/168gr VLD boatail spitzer
the 150gr 30 cal needs a 1 in 14" twist for proper stabilization.a under stablized bullet is an imediate problem and will manifest between 50 and 100 yards depending on how under stabilized it is.
however a over stabilized bullet will take 300 to 350 yards to manifest.you wont hit the broad side of a barn at 500 yards with a 150gr 30 caliber bullet with a gun that has a 1 in 10" twist
a .308 would be less of a problem being that it usualy has a 1 in 12" twist and thats fine with a VLD BTSP