I just loaded a batch of 22-250 with AA2520, RL15 and Varget. I am going to try and get them to shoot out of my rifle. If they don't I can send them to my buddy who has an AR with a faster twist and should stabilize them. Hopefully they work decent, as I have a ton of them. I did get about 3 out of the bag that didn't have the rear core in them. Thought that was kind of weird. A few has misplaced cannelures. No worries on those ones though. I might have to dig through some of the other bags and see if there are anymore missing rear cores. With the powders mentioned it should be near 3500 and hopefully push them fast enough to stabilize. Scotty