Up until shortly after the turn-of-the-century Live Bird and Inanimate Target guns were limited to 8#

The Baker Gun Quarterly, Volume 5, No. 3, May 1900 had an article on the weight of Trap/Pigeon guns used by Capt. A.W. Money (8 pounds - Money used a Greener, Smith, and Parker), C.W. Budd (7 pounds 14 ounce Parker), H.D. Bates (Winner of the 1900 GAH at Live Birds; 7 pounds 13 ounce Parker), R.O. Heikes (7 pounds 15 ounce Parker but after the GAH at Live Birds he went back to his Remington hammerless and won the 1st GAH at Targets), J.S. Fanning (7 pounds 15 ounce Smith), W.R. Crosby (7 pounds 12 ounce Baker), and Col. A.G. Courtney (7 pounds 14 ounce Remington CEO).

And most of these fellas were using 1 1/4 oz. 3 1/4 Dr.Eq. loads