Thanks , and I am sory for the typo, H 4891, I got thr load info from my Lyman book, which lists 56.6 as the max load. I promptly went home and pulled and measured every round from that run. They all checked out, I was using new brass,I have fired several rounds of this out of onother loading run, with no problems. with no signs of pressure, I haven't got a clue as to why the incident occured. I am very glad you informed me on the frame. I like being able to write and ask these questions, and get reliable answers.
Would the frame on my 223 handi fit the 280?
Thank s all for your help, I will try to find the sticky. Be assured I will be very carefull in the extream, in my future reloading.
Thanks again, Stan