Does the brass stick and fail to eject, or does the ejector miss the rim? If it's sticking, use the ejector tune info in the FAQs, basically, install a BB ahead of the spring, polish the ejector claw and housing, and polish the chamber. Make sure the chamber is clean and dry, the ammo the same, no case lube on it. The alternative is to convert it to an extractor, see FAQs for that also, your smith should be able to do that, I do my own on a drill press.
I've shot 230gr Failsafes(H414) and 250gr Speer spitzers(BL-C2) in my RMEF, both shot 1" 100yd 3-shot groups.
Tim