The 158 grain bullets I am using are all semi Jacketed bullets. I really do not know if 158 cast wad cutters will shoot well out of a 357 mag case or not. I think that they would, but I have no personal experience. I am going to be doing some experimenting with some 180 XTP's and 200 grain round nose bullets in the not too far future (both jacketed). I do not have a 44 mag barrel for comparison. From what I have read on this site, the newer 44 mag barrels are much more accurate than the older ones. The groove diameters have been reported at .429 and .430" with a 1 - 38" twist. The older ones were in the .432" range. About the only way to get the older ones to shoot any good at all was to use over sized cast bullets or ream it out to a 445 and push the heck out of them. I think it is a toss up which one is more accurate now (357 vs 44), but like I said I do not have any experience with the new ones, just a few reports I have seen here. I have not seen Paul hanging around here lately. He has done some extensive testing with a 357 barrel. He has not reamed his and has done quite a bit of experimenting with heavy bullets, 357 mag cases and 360 DW cases. He was using both heavy cast and heavy jacketed bullets. Maybe Quick can help us here with this to do a search. I tried but did not get the results I was looking for. Tim has a good memory about this stuff. Paul's handle was paul1157 or some thing like that. If I remember correctly he was getting some where in the 1" range at 100 yards with his best loads and I think he was using a taper crimp, not a roll crimp. I know that Quick (Tim) has recently ordered a 44 mag barrel and I do not think he would unless he was convinced they would shoot straight.