Tom: I found those loads on the website. Note the Bismuth is 2 1/2"

12g Bismuth 2 1/2 @ 1400 fps 1 1/16 oz. - 9800 psi; 1 1/8 oz. - 10,000 psi
http://gamebore.com/uk/cartridge/game/12G-Gamebore-Bismuth
12g Tungsten Impact 2 3/4 @ 1400 fps, 1 1/4 oz. - 9900 psi; 1 3/8 oz. - 11400 psi
http://gamebore.com/uk/cartridge/game/12g-impact

1 1/4 oz. and 1 3/8 oz. at 1400 fps will have substantial recoil, and I would not use those loads unless the head of the stock was glasbedded or CAed.

Split down the middle Fox ready for staple and accraglas repair