With semi autos the length of the shell can be just of much of a devil as the load, I am sure there are 2 1/2" shells with the correct recoil profile to work the action, might not feed/eject correctly though.....most semi autos have a too short too long window.....I roll crimped a worst case scenario load for Tom Armbrust to test for my Browning gold light ten, it came in around 10k which was safe for that gun but the whif of a roll crimp left untrimmed 3.5" rem loads to long to feed from mag tube....too short of a shell might try to load at a bad angle too.
You could also get some light 2 3/4" loads and not worry about anything:)
