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I ordered a box of 3" Lightfield Commander cartridges to try. They are advertised as 601 grain slugs with a muzzle energy of 1800 fps. This computes to 4,322 ft-lbs. energy, but they list the muzzle energy at 3,322 ft. lbs. What happened to the other 1,000 ft.-lbs.?

I read here on an archived thread that there is a company which produces a sabot that keeps pressures in the safe range and makes 6,400 ft-lbs of energy. They called it a BPI sabot. I can't find any information on this elsewhere, so maybe you guys could fill me in on this. Anyone use these...