.020 to .025 ? What kind of American iron are you shooting ? All my Remingtons, Lefevers, and Parkers are much thicker than that - closer to .060. If yours are .020 you're right , don't do it. But if they're closer to .040 or thicker, it only takes .005 on a side to equal .010 choke and that's a IC. LM would be .015 or .0075 on a side. It doesn't take all that much to make an improvement. I have 10 Remingtons, 2 Lefevers, and 3 Parkers, all of them with close to .060 wall at the muzzle. I wouldn't think pressures are more than a 1000psi or so after 30".
Last edited by Paul Harm; 04/06/18 04:06 PM.
