I got a few boxes of the 12 gauge 1 oz stuff, years ago. I found the recoil to be quite sharp and after firing, the case were no shorter than a 2 3/4" Win AA case though they were marked 67 mm I believe. I bought them from New England Arms as that was what he recommended for a 2 1/2" chambered Brit gun. I made much more suitable low pressure reloads with 2 3/4" Win AA cases with IMR data. even factory light trap loads (2 3/4 dr eq. 1 1/8 oz shot) kicked less than those gamebores.