6.5 prc hornady match a-tip 153 bullets

I had a good load at 57.8gn of H1000 in a 26" 1:7 barrel, BR2 primers and ADG brass. This load started to show some slight pressure signs above 90F. It shot great, except . . . I shot a long range match with it and 5 out of 50 bullets never made it to the target (i.e., the bullets blew up). Hornady is now telling people that their bullets should not exceed 290,000rpm.
 
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