I'm not sure what the case capacity is on the LRM. My stw is around 98 grains h2o to the best of my knowledge. With that much case capacity I am convinced that without a 28" or longer barrel that you might as well step a size down in case capacity. Not saying it couldn't be done in a 26" because it has. This all makes me wonder if the LRM would have saw more success in 28" barrels. I also understand that poor brass is a bothersome problem to remedy.