I had a squib at the range the other day. I had two other no-powder squibs with my 550 and upgraded to a 650 primarily to stop that from happening again.
And it became clear that had actually worked. There was powder from the round all over the place. Inside the gun, in the handle, on the shelf.
The primer fired---the powder did NOT.
For the records: 9mm cast-lead 115 gr .356 Bayou Bullets RN cast lead, 1.161 COAL over 5.5 gr Power Pistol and CCI small pistol primers, fired from Springfield XDM 3.8 Full-size. Shot thousands of rounds with NO problems.
This has caused considerable head-scratching. The only thing I can come up with is the crimp was a touch too light. I know it's supposed to be neck-tension only and I'm thinking I went a little too far. You can see the crimp line but can't scratch it. Sometimes it fades a little because the bullet coating is not rigidly uniform.
Thoughts? TIA.