So I traded this guy out of an old 3 screw SBH 7 1/2 incher. He told me he never could get it to shoot well. Well that didn't really surprise me, I know a lot of guys that can't shoot a 44mag very well. Cleaned it up real nice, (it was leaded up pretty good) loaded some of my 260gr. lead boolits sized .430 over some 2400 and went to shootin....didn't do to well, managed to hit the target every time (8 1/2x11) from 25 yds but it covered the WHOLE thing..had some 200grainers also sized .430 with 8.5 grs of 231 so thought I'd try those. VEEERRRYYY good, shot the center out...hmmmmm, says I, tried the 260s again with 231, uh-huh..more of the 200s with some HS6, yep, 260's nope...quite a bit of leading too I might add. Cleaned it up again and went to measuring, throats are .432 (no surprise there) could start a .416 pin gauge in the bore but only went about an inch...o.k. we have some bore constriction. I just happen to have a lapping kit, so cast a few (30) boolits and proceeded to make up some lapping rounds using the 200gr Lee RNFP over 3.5gr of 231. (I load them nose down, flush with the case) Shot 24 (shoot six, scrub bore, six more ) cleaned er' up, the .416 gauge slips all the way through, .417 won't start so I'm good to go. Did the 100 strokes with the bore mop covered with lapping compound, clean again (real easy this time)....Same 260gr. .430 boolits (RCBS mold) over 16.5 gr 2400, 25yards, 1 1/2in group....no leading...yep I'm pleased...I've done quite a few Ruger 45 colts, but they were all fairly new guns, I was surprised that a gun this old and well used (and boy it is) would still have these issues...obviously I need to shoot this a lot more to confirm all this, but I'm pretty sure the results will be the same....