I haven't had a chance to try out my most recent changes but should be able to get to the range next week, I hope. I'll keep that tip in mind though. I found an earlier thread where someone was also complaing about hangfires in his 500 Jefferies. He noted that the freebore in his chamber throat was so long that when the bullet made contact with the lands, the base of the bullet was 1/4" out of the case mouth. After checking mine out, I determined that when seated to the correct cannelure seating depth, I still had .647" left to the lands. I am using the Lee factory crimp die now so I think that will make up for some of my hangfires plus I'm using Federal 215s now and also a filler for anything under 128 grs as Woodleighs manual claims. I also loaded some with a little faster powder. We'll see.