for its velocity my f class t/r rifle is 30" long bull barrel most of our club shooters shoot 20-22" 308's (some even cut them down that those lengths ) and they work good at 300yrds now take that same gun and try shooting at 1000yards and some ran out of come up on thier scopes where as i still had plenty left(1 shooting 185gr pills had to go with a 30moa base). plus with the thicker barrel heat is not as much a problem than with the thinner barels.