I prefer to consider myself reasonably intelligent. Tonight I wondered. I was shooting a few targets tonight. They were from 450 to 850 yards. I would shoot a few rounds, then switch guns. Things were going pretty well. I had the wind about figured out for each target. I was shooting the 850 yard target with a 270. First shot was good, second shot was good. Third shot, what the ???? Didn't feal right. Didn't sound right. Didn't see any dust kick at the bottom of the target. Hmm, thought I. Went to open the bolt, and it stuck near the top. Tugged on it a bit, than slapped it opend with my palm. Ejected the shell in my hand, with no neck on it. What the?? What caused that? This load has shown no signs of pressure. Didn't kick hard iether. In fact it kicked soft. Turned the shell over, and there it was, 243 win. One more lesson learned.