Several issues: 1. Kent seems to have resolved the pellet brittleness/fracturing issue. 2. Bismuth is only slightly harder than lead so safe in vintage barrels. 3. I've been unable to find published pressure data for any of the loads but pressures are no doubt close to the SAAMI max. of 11,500 psi. 4. RECOIL would be substantial with all 3 loads: 3" 1450 fps 1 3/8 oz., 2 3/4" 1350 fps 1 1/4 oz., and 2 3/4" 1325 fps 1 1/16 oz. I would not use them, even in a LRWF, unless the head of the stock was glasbedded or cyanoacrylate impregnated.