Tell him about the Sherman Bell tests. Tell him lots of people shoot 2 3/4" shells in 2 5/8" chambers knowingly without issue. Tell him a lot more people have shot 2 3/4" shells through 2 5/8" chambers unknowingly without issue.
Stuff like this bugs some people so tell him he can trim his hulls if he feels he must, it's a one time step for each hull. Tell him while he is at it, light loads like 7/8 12ga are very effective, a joy to the shoulder and good for an old gun.
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