Sorry, giving English standard loads. 13/16th. ounce for 20 bore and 15/16th. ounce for 16 bore. That's the load you would find in the standard 2 1/2" cartridges here in the U.K. and what the guns were designed for. 16 bore guns are Proofed with the 1 ounce mark just to confuse but the standard ammo is usually just under that. 7/8ths. ounce is correct on 2" guns. Lagopus.....