okie
Gold $$ Contributor
what is Fa? typo?Fa
Well, I dont use many Bartlien barrels at all. But a 4 groove Brux will tune close to a 4 groove Krieger. My opinion on the matter is, a 5r barrel changes the pressure curve. The bullet requires less force to engrave into the rifling. I believe thats why the tune can end up being quite different.