Thanks to all who replied. I think SHERM 61 was on the money with his solution. I guess I failed to mention that I was using Lee collet neck sizing dies, I've used them for a long time, and I frequently check the case length, and trim when necessary. I full length resized the same cases and had no trouble at all with the extraction. My theory is the cases were swelling some at the case head, which the neck die wouldn't touch, and with the camming power of the bolt, I couldn't feel much resistance when I chambered a round. Anyhow the problem is solved.

Thanks

Mike DeLuca----wyomike