It's really more about your ability to shoot than barrel length or the velocity it affects. For me, I hunted with 7.5" guns for years but later found that a 4 5/8" Bisley in my hands is like launching guided missiles. For whatever reason, they just work better for me. A lot of folks prefer a 5.5". IMHO, a 6" is perfect for a DA and I've threatened to have my SRH's cut to that length.