44 Mag case bulge. Out of round chamber. ??

[nitro-express]

Here’s an angle to chew on oversized picture to see it all, you have a chamber it is whatever it is you have I fired resized brass that your shooting very light loads, maybe not enough to evenly. Expand the entire case to the chamber? Thus you notice irreregularity? It’s only popping out maybe where it’s softest or weakest rather than complete expansion? Fire a factory load and compare the two case before and after? See size difference I don’t know maybe a stretch but might be happening?

Firing a factory load is a good idea. This is a bit of a challenge for us reloading types, when faced with the prospect of buying a box of ammo for a few test shoots. I have done just that on occasion, and have the partial boxes of ammo left to prove it. I've also loaded up full power loads, which can be a challenge at times. Calibers with straight walled brass act a bit differently than regular bottlenecked calibers. In essence they (straight walled calibers) are all neck, and in a bottlenecked caliber, the neck is the last place you'd look for pressure signs or anything else unless some issue manifests itself.

Nitro