KSH

Thanks all for your reply's I have learned that my loads are hotter than I thought they were. "Until now they have showed no signs of high pressure" I have scaled and disassembled all higher weight random rounds and found no issues. I will shoot my remaining stash. I'm rebuilding my XDM and will be buying two more sets of dies so I can develop individual loads for for each pistol.

The brass is bulged in places where it is unsupported while the gun is in battery - this points to pressures so high they stressed the brass beyond its elastic limit. There way more case damaged than what is normally unsupported. I will accept that it possible that came out of battery prematurely due to a hot load.

I just did a search on "Out of battery Detonation" and a lot of the pictures resemble my casing. This morning I disassembled my XDM and found nothing wrong. In 13000 rounds I have replaced various springs a couple of times. This morning I ordered all new springs, pins, striker safety and striker

My concern here is not the "reload", but an issue with my XDM The consensus here is that it is not an issue with my XDM. It is not an issue with the XDM. The brass would not fire form as shown if it was out of battery. This is the result of an issue with your load, and your reloading knowledge base / techniques.4.4 is the max load for a 124 loaded out to 1.150. Quickload shows pressure of 28K PSI with 4.5 GR 231 under a 124 MG JHP loaded to 1.15. When you shorten the OAL, pressure increases. This is exacerbated when you are using fast powders and cases without lots of extra volume. Reducing OAL to 1.090 spikes pressure up to 38K PSI - in excess of +P pressures. My press doesn't hold tolerances +- .001 OAL or .05 GR. I doubt yours does. So if you end up with a load at 1.080 and 4.6 GR (normal variation) Quickload shows pressure goes up in excess of 41K PSI. You need to use a lighter charge, a longer OAL, or a slower powder. Or this will happen again. You're lucky it was good quality brass and not a piece of AMERC or you'd be picking up parts of the frame and mag from the floor. Thanks for the info. Your estimate for what's +p is low. Below is from Wiki. But either way the easiest way to build some cushion back in is to go back to two separate loads for each 9mm https://en.wikipedia.org/wiki/Overpressure_ammunition SAAMI specifications for common +P cartridges are as follows: Cartridge Standard pressure +P pressure Notes 9 mm Luger 35,000 38,500 10% increase .38 Special 17,000 18,500 9% increase .45 ACP 21,000 23,000 9.5% increase .38 Auto 26,500 36,500 38% increase to make .38 Super .45 Colt 14,000 27,500 96.4% increase, For use in certain modern revolvers and lever rifles .257 Roberts 54,000 58,000 7.5% increase The +P+ designation is not currently used by the SAAMI, but is used by some manufacturers to designate loads that exceed the +P SAAMI specification. One source lists the 9 × 19 mm +P+ loading as having a pressure of 42,000 psi, an 18% increase over the standard pressure of 35,000 psi, and the .38 Special +P+ as 22,000, a 29% increase over the standard pressure.[5]

I need 1.150 to not be touching the lands on a very clean barrel After 100 rounds I need 1.100 to function reliably on a full days shooting. I then backed it down 1.090 to give myself cushion.

1.090

My Crony shows these at 1075 Which would be 133

I practice with IDPA targets I was practicing Mozambique's when it happened, at the same time the next lane torched off a rifle. So I did not notice any thing different. As far as the load, it is a load both my XDM and M&P like.

My concern here is not the "reload", but an issue with my XDM The consensus here is that it is not an issue with my XDM.

It looks like it fired out of battery, because of the way it is formed. Did you change your load after it happened?

XDM 5.25

Here is a pic of the casing in the barrel. It also ejected the casing, the reason i noticed it was because it fell on the table to my left.

Not more than twice from me and I sort by head stamp But a older case could have gotten picked up at the range

4.5 gr of 231 124 gr mg hp

Yes this is my reload. This is my first incident in over 20,000 reloads in the last couple of years. But it looks to me it was not fully cambered when it went off, also looks like a light primer strike.