Wondering if anyone could help me try and diagnose a problem I had with some test loads in 454. I am using new Starline brass, Penn 340 gr hard cast lead bullet, Win small rifle primer, and H110 powder. Got load data as close as possible for weight bullet out of Hodgdons 2015 load magazine. Loaded some test loads starting at 22.5gr and up to 25gr. When shooting first group of 22.5gr, fired two rounds then third round nothing, like a bad primer? Did not hear a pop or feel anything other than hammer dropping. When tried to re-cock hammer, I'm locked up and trying to open cylinder is a no go.
So I figure I have a squib stuck in barrel/forcing cone. Easy fix with small dowel rod at home to clear revolver. When I inspected bad round, firing pin is indented but not as much as other two rounds I shot. I pulled bullet to make sure there was a powder charge which there was? All powder unburned except for a little clump stuck together? My question is, what would cause it? Obviously powder is suspect though it is been stored properly, cool, dry, ect? Could a primer be under powered enough to not give proper ignition? Have yet to get back to range to fire other test loads. Only thing I noticed unusual about the bad round was the primer seemed seated fairly deep, but again it came from a 500 lot of new Starline brass. Thanks in advance for any insight.