Powder can blow out the pipe unburned-this I know from experience. I've loaded .375 -300 grain bullets in my Mark V Weatherby. I've packed those 378 weatherby jugs with 116 grains of 7828 behind the 300 grainers. I set the charge off with the shiity CCI primers. The last 5 grains did very little in the velocity gains. Theoretically if I could get a good burn possibly if I had a longer barrel. (not sure on that)There is alot of smoke and stink after that stuff blows out the pipe. I don't have fancy graphs but I can tell when the I get that big puff of smoke coming out the pipe that I'm not achieving a good burn. I didn't have Fed 215 primers but I know they are a hell of lot better igniters than the CCI in the big jugs. Kids don't do this at home. Detached retina stuff!!!!!
