So I picked up one of the Irunguns police buyback M&P45's and got it out to the range last friday. It shot BDX 230gr FMJ just fine, grouping OK and right on POA at 7-10yds.
I also tried a couple different reloads consisting of two different cast 200gr SWC bullets. One was the venerable H&G #68 and the other unknown (shorter, fatter ogive than the #68). Both are from Ben Hunchak, cast in his medium alloy and sized to 0.452". The #68 was loaded over 4.9gr of WW231 and the other bullet over 4.5gr of Red Dot. These loads cycle my Norc 1911 100% (though the Norc doesn't feed the #68 worth a damn) and shoot groups that are just slightly larger than BDX 230gr.
The M&P functioned 100% with everything I tried but it shot the cast bullets like crap. At 7yds the H&G #68 loads would string 8+" vertically with minimal horizontal dispersion. The other load was a bit better, but still grouped over twice the size of the BDX loads. Not nearly as much vertical stringing, though. The M&P uses conventional rifling, not polygonal so that shouldn't be a factor. I just went and cleaned it and there was very minimal leading, just a couple light marks, so it wasn't smearing the bullets horribly and they don't look to be undersized for the bore, either.
Any ideas on why it hated the cast bullets so much and what I should try next to sort this out?
Mark
I also tried a couple different reloads consisting of two different cast 200gr SWC bullets. One was the venerable H&G #68 and the other unknown (shorter, fatter ogive than the #68). Both are from Ben Hunchak, cast in his medium alloy and sized to 0.452". The #68 was loaded over 4.9gr of WW231 and the other bullet over 4.5gr of Red Dot. These loads cycle my Norc 1911 100% (though the Norc doesn't feed the #68 worth a damn) and shoot groups that are just slightly larger than BDX 230gr.
The M&P functioned 100% with everything I tried but it shot the cast bullets like crap. At 7yds the H&G #68 loads would string 8+" vertically with minimal horizontal dispersion. The other load was a bit better, but still grouped over twice the size of the BDX loads. Not nearly as much vertical stringing, though. The M&P uses conventional rifling, not polygonal so that shouldn't be a factor. I just went and cleaned it and there was very minimal leading, just a couple light marks, so it wasn't smearing the bullets horribly and they don't look to be undersized for the bore, either.
Any ideas on why it hated the cast bullets so much and what I should try next to sort this out?
Mark
