+1 to that.Bumpfiring is nothing more than to create a ewww and ahhh when you and your buddys are shooting.It has no practical use.But, if ya want to use up your ammo quick for giggles, there is no better way.:Waste of ammo.
I guess if you wasted enough ammo practicing bump firing to get good at it there might be value if you were ever over run by a crowd of unarmed people. But if one of the crowd had a gun you would be dead when you stood up from cover to bump fire your rifle.
Easy answer, just cut the chamber as deep as needed for multiple rounds to be chambered in the barrel at one time. Be sure to take video and pay up on your medical insurance. : The sale of the video might even pay for your hospital or funeral bill.I tried this bump fire technique once with my bolt action 303 but the results were always the same.....just one round fired
I'm going to guess you're shooting that out of an AR-15...5.56 Federal XM193 is what i shoot and at 50 cents a piece it's expensive...BUT hot damn auto fire is always fun ya gotta do it once in awhile...:thumb::