6" barrel, 30 years ago, using shortened 223 cases. With the FAR greater case capacity of 460 Rowland, fully supported barrels, thinner cases (ie, more powder space) gaining 2 grs of powder space by means of a BIG hollowbase in the .45 bullet, you "think" 2300 fps, 70 grs is an outrageous claim? You are just ignorant, that's all. Mag Safe was getting 2000 fps in a 4" barreled 357 Sig, 64 gr jacketed bullet, 10 years ago, dumbasses.