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Shooting today had a little bit of a etchy experience with 140 gn Leverevolution cartridges shooting in a gp100 .357 magnum. When I first started I loaded 3 Leverevolution rounds with 3 140gn xtp handloads. I wanted to compare recoil to my hand loads. All in all there was nearly no difference in the two as far as recoil and POI. I shot about 25 more of the handloads, and then about 30 180gn xtp hand loads. I also had been shooting a 38. Before rapping up I went back to the gp100 and finished of the last six leverevolution rounds I had. The recoil seemed significantly harsher, but I thought it was due to the fact that I had just finished shooting 38s from my sp101 and of course the magnums punched harder. After I finished them off I checked out the casing and much to my surprise the primers where flattened. I had not at all expected that from a factory round. Is there something I could be missing here? The first three that I fired did not flatten like this. The on the left is from the first three and looks fine. The Leverevolution cartridges are slightly shorter than regular .357 brass to make room for the polymer tip. So I wouldn't expect fouling from my handloads to effect them. Aside from that the pressure seal from my hand load was keeping the brass nice and clean after firing. What could I be Missing that could have caused this, or is it common for the leverevolution rounds to be loaded that hot? Considering that the first three were fine I tend to believe I'm missing something here.
