I've bought and shot commercial store loads for years. For 12ga upland hunting, I buy 1 1/8oz /3 dram 2 3/4" loads for both fluid steel and damascus. I shoot lighter for clays.
I haven't found there is any difference in recoil between 2 1/2 and 2 3/4" shells. And if you look at the recoil formula, shell length is not a factor. It runs out to about a 300psi difference in chamber pressure but I can't tell any difference and I figure, recklessly perhaps, that my guns aren't going to blow with a 300psi increase. Moreover, if a person is really concerned about shell length, try measuring a AA fired hull and you'll find it is around 2 5/8".
People have their favorite products and loads and you make up your own mind.
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