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Benchshooter, I had this same problem with a .577 trying to use H 4350 and IMR 4350 powders to get a nitro for black loading. I had powder that was charred to a brown/orange color and bullets driven just into the barrels 5 or 6 inches. I had hang fires, misfires, and bloopers where the bullet left the barrel but was practically rolling along the ground! I gave up on these powders because of all the associated problems and because I was afraid of getting a blown barrel or worse. In fairness to these powders, I think that trying to get them to perform at a reduced loading density was part of the problem. Also you need to use only the hottest magnum rifle primers in loading large cases. I also think some kind of crimp on the cases is a good idea because of the lack of starting pressure and because the firing of the first barrel load could partially pull the bullet on the second load. I was using backer rod to fill the excess space in the case but I do not think this caused any of the problems I was having. These were roughly 80 grain loads with a 650 grain hard cast bullet in front of them. 4831 also caused the same problems and both left lots of unburned powder in the barrels. |