Shooting subs with 300 blkout and 308 are going to be almost exactly the same, same bullet at the same speed. The only difference is barrel length and twist. Faster powder, faster twist, shorter barrel 300blkout. Slower powder, slower twist, longer barrel 308 win= the same
Isn't it funny how day by day nothing changes but when you look back everything is different.
Nowadays people know the price of everything and the value of nothing.