10 G 2 7/8 inch increased shot weight from Black Powder era 1 1/4 oz to 1 3/8 oz when progressive powders were introduced in the 1930s. Increasing even more when the shell was expanded to 3 1/2 inch. Search on line you can probably find specific details. Double Gun Journal ran a 2 part series on Ithaca’s Super 10 that has detail on loads.
I prefer Black Powder ballistic equilvent 1 1/4 oz 2 7/8 inch loads using Green Dot, or 1 1/8 oz target loads with Red Dot. You could load heavier but thickness of metal is only one thing to consider. One of my short 10s, now restored, came to me with stock problems from heavy loads. 2 others are Damascus, probably safe with heavy loads but see no reason to push them.
Parker club web site is perhaps the best source of current short 10 information including recent pressure test of Green Dot and Red Dot loads.
Boats
Last edited by Boats; 12/23/17 06:15 AM.
