Don't have a Rhineland .45 conversion, yet.
About 15 years ago,I took a Lowe 1888 Commision Mauser and adapted a Thompson sub gun(16") barrel to it. I modified a Weaver rail to mount a 2.5X7 Intermediate Eye Relief scope. With a Speer 185gr "Flying Ashtray", Win. larg magnum pistol primer and Unique powder(won't say how much,look under .45 ACP Contender loads), it shoots 1" at 50 yds. Does HORRIBLE things to a Coyote, jackrabbit or stock tank turtle. I haven't shot anything bigger yet, don't like deer and not going to shoot one just to see what it does.It's only a single shot as I haven't figured out how to adapt a magazine to it. The 1888 is a totally diferent design than the '98, so the Rhineland adapter won't work. I visit the Rhineland web site frequently and read their comments. They say the Enfield feeds more reliably than the Mausers, but a little discreet Dremel work cured that problem in my rifle, and the Enfield is just BUTT UGLY!!!! ,IMHO. Anyway, I plan to get a Rhineland Mauser conversion and buy a ragged out Mauser action to put it on so I can have a mag fed , bolt action .45ACP carbine. I just wish they would make it in a double stack configuration. BTW, I'm a Dallas boy, Remember the Alamo!