It occurs to me, having seen cook-off firings twice, to suggest that when you work up a load of any powder to maximum, unless you absolutely know you will never use the gun rapid fire, you should intentionally fire enough rounds at a rapid fire pace to get it warm. Then put a body temperature round in and let it sit in the chamber it for about a minute to let it heat and the carbon fouling stiffen a little, then fire it and check for pressure signs again.
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