6x45 should be a great round to run in an AR. Too bad nobody makes factroy ammunition because I hate having to feed an AR on my shingle stage press. I can barely keep up with my bolt rifles. My Sierra manual has quite a bit of load data on the round and so does Hogdon's web site.
Try DTech the show the 6x45 as one of the chambering they do. ar15barrels.com has it on their list as well. Or you can buy this one on Gunbroker.
