12 groove barrel

[Goatwhiskers]

Figured I'd put this here, couldn't really figure where it fits. Is there any reason why such would be any less accurate with cast than any other barrel type? Keeping a long story short but got a bud claims his is mucho inaccurate, told him I bet proper fit would solve his problems. He has no clue what I'm getting at so got some teaching to do. Waiting on him to slug his barrel, bet I got some 44's on the shelf that'll solve his troubles.GW

[JSnover]

http://www.leverguns.com/articles/fryxell/microgrove-barrels.htm
A pretty good read on this topic. You're probably right about a proper fit: as always, slug the bore if you can, a fatter boolit should do the job.

[MT Gianni]

Frequently Microgroove bbls are not always without diameter variations.

[funnyjim014]

I've heard of barrels leaving factory with only one side of barrel rifled. Apparently marrlins QC has suffered the past few years