What could cause this?
WHY are you using small pistol primers ??What could cause this in my 300 Blackout loads? This brass is 223 cut downs. Using RCBS 300 blackout dies.
CCI #500 primers
150 grain bullet
15.5 grains of 296
This is about all the info I have on my loads.
My mistake..... #400 CCI, edited my original postWHY are you using small pistol primers ??
Yeah, primers totally blown out of brass, made a mess of my bolt, got jammed up a bit after ejection. Primer pocket does not look expanded at all.Are the primers backing out or are you blowing primers, as in expanding the primer pocket so the primers fall out?
15.5 Grs of W296 should be OK. What OAL?
I only loaded five rounds first, and these were them. I'm gonna go back to the bench and load five or ten more rounds and test them some more. I did go buy a box of commercial 300 black today and shoot them to make sure my gun isn't doing something weird, gun is freshly built too. So I'll see
load five or ten more rounds and test them some more. I did go buy a box
They were reamed, I've loaded thousands of rounds of 223,308 and 22-250 and never had this happen.Grassman,
Were your primer pockets reamed or swaged? I have quite a bit of experience with reloading military surplus stuff and I can say that most people that ream their primer pockets take it too far and end up ruining the casing. Swaging is by far the better way to go if you don't want to decrease the life of the brass. If they are reamed, my guess is that they got reamed too deep and can no longer hold a primer well enough to keep it in the pocket.
No, cases are not ejecting fine. But I don't see any expansion on the spent brass.If not mentioned previously, I'd check for case over-expansion. Blown primers are a very good indicator of extremely high pressure. Are the cases are ejecting fine? Posting a couple of pics might help the boys identify your problem.