Could it be as simple as you have some crude rolling around in the chamber?
Has the rifle and some loads popped any primers?
How many times has the brass been fired? weakness on some points on your brass, that it is starting to wear out, another shot or two, and where the dent was, will cause a case split.
I've had some fireball brass that was doing fine, and was on its 15th reload. Then 9 of out 10 rounds, ejected with just the bottom half of the case, and left the upper half, struck in the chamber..... bore snake took those right out with no issues...
Looked at the second batch of 10 rounds, also on their 15th reload, and with the old reading glasses on, you could see a real fine, circular crack, almost around each case.... fired the first two, and same experience. Otherwise brass looked fine.
Lesson # 27,005 on something else that can go wrong with handloading ammo.
Blow out chamber with a airhose, try a new batch of brass, if you can drop floor plate, do that also to clear/clean that...
I question if it is the powder having an issue.. Is the brass &/or the primers some sort of odd ball foreign manufacture, that is reloadable, but not really intended so.. because its made for 3rd world countries, like somewhere in Africa or Asia. Plenty of junk shows up on our shores, in time like these, and other problems created by the M.F DemocRATS.
