Over this winter I plan to continue with the development of my Hayabusa project gun by building a .457 rifle and a .410 shotgun version.... It is my hope for them to share a common valve, main tube and hammer, and a 500cc 250 bar (3625 psi) tank.... They will, of course, have different breeches.... Here is the ammo for the .410....



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The shell has been shortened from 2.5" to 1.75" and the primer hole drilled out to 11/32".... The shot cup holds 223 grains of #7.5 shot (0.51 oz) full to the top (about 180 pellets).... My target velocity is 950 fps, but that works out to 450 FPE, which even with 3600 psi may be a stretch....

Bob