I'm late on this discussion and I have not read all the replies.
I have been muzzle loading for over 40 years and have been active with many clubs, including NMLRA.
I once saw an ml pistol, with real bp, go off spontaneously about ten minutes after loading and, maybe fifteen after the last shot was fired. Lingering embers can do that.
Did you swab the bore between shots? I'm guessing, no.
BTW blowing down the bore is prohibited at all NMLRA sanctioned matches as unsafe.
Some lubricants can burn and linger hot.
I always swab between shots, even when hunting where time is a factor. But, I consider safety a factor of greater importance.
This thread reminds me of a couple others where proponents of unsafe practices brag "It ain't blowed up, yet". I just love the "yet" part.
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