I can remember in the 70's when I started trapshooting a lot of the shooters complaining about double A's separating. I had two come off in an 870 TC I shot at the time. Saw both begore anything happened. This was not uncommon. It seemed to me that a lot of them occured in guns with larger chambers or generous headspace. With trapshooters, these were almost always reloads. In those days there was a huge financial advantage to this. Seems a good reason to try for minimium resizing.
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