Hello reloading experts.
I've been trying to work up a load for my .300blk AR, and am stuck (figuratively & literally)
168 gn Sierra HPBT; 11.6 gn H4198; 1xfired S&B 300blk brass cases - fully sized
It seems that 2-3 rounds in each mag of my reloads fail to fully chamber and get stuck in the chamber. Stuck to the point where the forward assist won't budge it (actually makes it worse) and I have to either bang the stock butt on the bench while simultaneously pulling the charging handle back, or even prying the bolt back with a tool. (i.e. they get jammed in TIGHT!) It behaves as if a grain of sand is getting jammed between the case and the chamber wall. I've checked the measurements with a micrometer, and they seem to be the same as factory ammo. I've have S&B factory subsonics which run flawlessly, mag after mag.
I originally thought my crimp was not tight enough and the mouth of the case was catching somewhere in the chamber, but my last batch was "very" crimped and it made little, if any, difference.
I use Lee dies and have followed their setup instructions. Someone has suggested I adjust/tighten my sizing die to insure I get a better sizing - possibly even shaving the top of the shell holder down to allow the brass to get further up into the die? I have not tried this suggestion yet.
Any other suggestions? What might be going wrong, and how can I correct it?
I've been trying to work up a load for my .300blk AR, and am stuck (figuratively & literally)
168 gn Sierra HPBT; 11.6 gn H4198; 1xfired S&B 300blk brass cases - fully sized
It seems that 2-3 rounds in each mag of my reloads fail to fully chamber and get stuck in the chamber. Stuck to the point where the forward assist won't budge it (actually makes it worse) and I have to either bang the stock butt on the bench while simultaneously pulling the charging handle back, or even prying the bolt back with a tool. (i.e. they get jammed in TIGHT!) It behaves as if a grain of sand is getting jammed between the case and the chamber wall. I've checked the measurements with a micrometer, and they seem to be the same as factory ammo. I've have S&B factory subsonics which run flawlessly, mag after mag.
I originally thought my crimp was not tight enough and the mouth of the case was catching somewhere in the chamber, but my last batch was "very" crimped and it made little, if any, difference.
I use Lee dies and have followed their setup instructions. Someone has suggested I adjust/tighten my sizing die to insure I get a better sizing - possibly even shaving the top of the shell holder down to allow the brass to get further up into the die? I have not tried this suggestion yet.
Any other suggestions? What might be going wrong, and how can I correct it?