I have developed loads.
338/284, but caliber should not matter.
I shot it on a short action developed loads etc.
Pulled the barrel.

Later put it on a long control feed magnum action.
I changed out the head to a .473 head, pin ejector etc.

Today I was setting the scope and just shooting it a bit
and all 3 of my previous good loads jammed the bolt.

I am not really sure it is really a load problem, or maybe there is a problem with the bolt head ??

Any help would be appreciated.