Re: Shilen Ratchet rifled 4 groove barrels
I have a Select Match ratchet-rifled barrel on an 8 twist .223AI, and it is a freaking hammer!
It cleans super-easily, but I can't say it's much, if any better in this regard to any of my other custom barrels. The bore finish is the best I have seen though.
I was told by Shilen that the rifling profile engraves the bullet differently than conventional land and groove which enhances long range ballistics.
Other than that, not much additional info to pass along, but without question, I'd buy another in a heartbeat.