I would also be concerned with the patterning performance of a combination of 2 3/4" hulls in 2 1/2" chambers. The payload will get "choked" in the forcing cone, right when the pressure is highest. I think this would inevitably lead to an increased number of deformed pellets. Another option, if you want to keep your gun original, is to get tools to shorten your hulls and modify your loader to load 2 1/2" shells.
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