I believe I already know the answer and I'm just looking for reassurance. I've loaded everything from mouse loads to full tilt 310gr bullets at over 1300fps out of my 7.5" super Blackhawk over the years but the vast majority have been a 13gr of HS-6 under a 265gr cast bullet yielding a tad over 1300fps (max list is 14gr). I got an 8lb jug of powder just before the height of the shortage and since then I've run into a few hiccups like screws and pins backing out but attributed that to just an aging gun that has seen tens of thousands of rounds. One semi-major issue was where the cylinder locked up, and I think I've found the culprit of but haven't been able to verify that it was the issue. My cases are not sticky, primers are not flat (just a bit crisp on the edges) no flowing brass or primers. No real overpressure signs that I know of. My velocity is still the same when fired through my chrono as well. So that leads me to question if it is possible to have an overpressure situation without the traditional tell-tales? Hopefully, this is just a coincidence that all this happened with a new lot of powder but it has me second-guessing at this point.
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