Originally Posted by
Ridge Runner
I know that some bullets can't stand fast twist low groove number barrels at high velocity, a 257 Allen Mag with a 7 twist, 3 groove barrel will rip the jackets off 100 gr nosler ballistic tips as they leave the barrel at 3800 fps, with a 4 or 6 groove they do fine.
RR
Wasn't this the same with microgoove for marlin? They planned for 45-70's to mainly shoot fast jacketed bullets? Where the ballard rifling was more suited for deeper groove, good for lower velocity cast?