Mark and measure a loaded round and let it sit in the bottom of the magazine whilst shooting for say 10-20 rounds ... then compare it afterwards.

Does this ever happen in real life ?.Most loads will jump the crimp with that many rounds.
Everyone I know rotates their bullets (bottom to top) ever chance they get between each volley and with a three shot mag it wouldn't happen too often that the bottom one stays in the mag for ten shots.