a late reply to an older thread... I to have seen 20 vs 12 mix-up. in Sept '04 while shooting doves my cousin's son put a 20 in a 12. thankfully it did not fire and was found before a 12 ga. shell was chambered behind it! they were both shooting 1100's. I have a mid 50's a-5 and enjoy it although my wingshooting skills are not the most impressive. fortunatly doves are very plentful in my area(i hr west of San antonio Tx) Kurt.