When I started shooting a shotgun some 50 yrs ago most common field loads in 12ga were 3de-1oz, 3de-1 1/8oz & 3¼de-1 1/8oz. Heavy field load, also known as pigeon load was 3¼de 1¼oz while Heavy (High Brass/Duck) load was 3 3/4de-1¼oz. In 16ga light field was 2½de-1oz, heavy field was 2 3/4de-1 1/8oz & Heavy was 3¼de-1 1/8oz. 20ga was light field 2¼de-7/8oz, heavy field 2½de-1oz & heavy 2 3/4de-1oz. Browning A5's of the day if set properly would digest them all.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra