Quote Originally Posted by Volstandigkeit View Post
Something I've noticed with this rifle, is after sending a round, I can eject and rechamber that same piece of brass, which tells me the chamber is loose.
I could be mistaken, but I don't believe that your conclusion is the only possibility. For example, perhaps your brass is work-hardened and needs to be annealed.

What is your twist rate?

Have you tried any 160 grain or heavier bullets? Lighter bullets?
How many different powders have you tried?

I would not give up yet. There are myriad bullets and powders out there and just because your rifle doesn't like three different loads you have, does not mean that you won't find your tackdriver load with a little more effort.

Your rifle is still accurate enough for deer hunting at reasonable ranges.