In 1957 Winchester's heavy 3" 12ga load was 1 5/8oz standard was 1 3/8oz. Your model 21 was most likely made around then or before. Those new Long Beard shells had I think 1 7/8oz plus buffer . Hope they had nothing to do with blow-up but it's a thought.
__________________
" May you build a ladder to the stars climb on every rung and may you stay forever young "
Bob Dylan
|