.50 cal air gun hollowpoint slugs at 100yds: Umarex Hammer 388gr Hp slugs

Today we are testing .51 cal airgun slugs at 100 yds. These are shot out of an Umarex Hammer at 861 fps. Slug weight is 388gr and have 638 FPE at the muzzle. Gelatin is calibrated at 3.3" with a 590fps bb. Slug BC is 0.14 G1
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