Glad you survived unscathed, if shaken. Hate to ask, but how many holes in the target?

Occasionally weird stuff can happen. Once at a match, I had an ejected empty leave a smoke trail as it flew through the air. A whole bunch of people noted it and found the empty. The case web & head had a crack in with burn marks. No clue about what might have caused it, no excessive recoil or anything.

That you had perceived extra recoil, I have to wonder if you had a bullet just far enough into the bore that the chambered round pushed it just enough further forward to avoid ringing the barrel. Or, just maybe, a double charge.