Are you sure you're loading 1-1/8 ounce of bismuth in that 2-1/2" hull? Bismuth is only about 80% as dense as lead, so a 1-1/8 ounce lead charge bar will drop about 7/8 ounce bismuth by weight.
Also that 1200 fps muzzle velocity with bismuth will slow down much more rapidly than lead shot at that muzzle speed (with the same diameter pellets). Thus the bismuth penetration and killing power will be comparatively less at any distance beyond just a few feet from the muzzle.
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