I have a 6.5 WSM built on a defiance XM with CF barrel. Cold bore has no effect on it. I have a Mauser with Lilja Barrel in 7mm Blaser. Cold bore has no effect on it. I have a 28nosler proof CF Cold bore has no effect. I’ve loaded the N565, N560, Retumbo, 4831sc, H1000, reloader 26 and N570. All...