Thank the good Lord that you still have your fingers

Another reason to wear safety glasses.

In my years of shooting, I have had one squib. It disnt sound right, so I didnt fire the next bullet that had chambered. It was a factory bullet

There are a few culprits that this could have been
1) double charged bullet

2) Weakened case wall

3) Wrong powder

4) Bullet set back

My gut tels me this was a double charged bullet. But it could have been any of these.

As a reloader, I do trust my QC a bit more than some of the cheap stuff that I see out there.

I load range pickups almost exclusively. I havent had any problems.
I shoot lead 180g in my Shield and M&P40C

The brass in most cases, if its been reloaded a few times will lose its ability to hold a primer. You can also catch cracks and bulges if you inspect.

Good luck..... this is a good remeinder to be careful