Those rounds look as though they have suffered setback. The 40S&W round is REALLY REALLY prone to that, AND for good measure when it happens there it takes very little make a heck of a pressure spike because the 40S&W is pretty high pressure. Corbon also has a reputation for pushing the pressure envelope anyway. Bad mix - there is very little margin of error. I have held for several years that the 40S&W is not a cartridge that most should use for this and other reasons. It is truly an experts only, no non-dedicated personnel should apply round.
It is common knowledge in some circles in which I run, outside
of this forum, that one should NEVER chamber any 40S&W round twice. Period. Shoot it or otherwise
safely dispose of it. Sadly, other than on those 2 forums and among the folks who populate them, I
have not seen much about this. It is most
likely is that the problem was over pressure ammo from the causes above, plus of course the possibility that storage
conditions could have compromised the powder; heard of such but not familiar directly.
You are darned lucky, and probably were protected from worse injury by the pistol and its quality.
I appreciate your feedback, and do believe safety is important but wonder about that many, many
thousands of LEOs that carry 40 cal that unload and reload their pistol.
I carry a Shield 40 and do cycle to the next round in the mag so I dont reload the same round so many times.
I think there is a risk but dont believe the setback occurs so easily, or you would hear of many more kabooms than we do.
I have had other 40s in the past, and never had an issue.
A kaboom gets a TON of attention, and pictures on every forum. It happens, but doesnt seem to
happen often.
In fact, it seems the vast majority of the small number of kabooms communicated are older Glocks 40s with an unsupported chamber.
I believe that setback is to blame in only a percentage of the already small occurance, as I believe a
squib or double charge are more to blame.
Either way, I believe that as you go from JHP to FMJ and back, after a day at the range, just make sure
that you rotate. Try to keep the rechamberings in 40 as low as possible, but for me a few chamberings
per year on a bullet will not set it back.
I do shoot my carry rounds off every year, and get new, but thats for 40 and 45.(when I carried a 9, I
did the same thing)
If you want to prove it, take a round, get the calipers, chamber it 5-10 times, measure it again.
I think you will see the OAL will be equal.
Do it 30 times, and I bet it will be .03 or so shorter...... Enough to raise pressure
The 40 cal is a great defensive round, nothing to be afraid of.