I've used scads of Federal primers
in my M1. Also Winchester, CCI. Never a problem. I think this slamfire business is overdone. Yes, it can happen, but if your rifle is in proper order and you always load from the clip or a single-loading device, it won't happen. 'course, you also must be sure to seat primers fully; a 'high' primer could slamfire. Headspace must be correct, and you must be sure to size your brass properly, so get a case gauge and use it. Too much sizing is as dangerous as too little. I have a sizing die set up for my M1 only so I don't have to fuss.
Other than that, M1 is easy to load for. I've used H4895, Win 748, IMR 4054 with good results, all with 150 gr FMJ or M72 173 gr match bullets. Get a good book, like Scott Duff's M1 books or the NRA booklet, and go to it.