Trying to choke a CZ P10C

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Friday I took my P10C to the range for a bit of safe cleaning. I rounded up every recognizable peice of 9mm ammunition I could find that wasn't my current duty use ammunition supply. Everything. Commercial boxes, hand load boxes, random rounds out of the spares bucket and even fishing out the rounds rolling around loose in the bottom of my range bags.

I ended up with:

1 box of 50 Monarch 124gr JHP
1 box of 50 Monarch 115gr FMJ
1 box of 50 Fiocchi 124gr FMJ
1 box of 20 Speer 124gr GDHP
1 box of 100 WWB
2 boxes of 100 each Independence 115gr FMJ (Aluminium case)
250 rounds of... uh... stuff.

By "stuff", I mean just that. Mostly the few rounds that are left over after an IDPA match, or tossed in a bag at the end of a range day or downloaded work ammunition. You know, the rounds that just kind of accumulate. In the "stuff" pile there were at least 30 rounds of very tarnished Winchester Silvertips that had to have been at least 10 years old because that's the last time I carried those. There were also a dozen and a half Magtech Guardian Gold rounds, also highly tarnished, that I have no clue when they were purchased... or carried. There were some Winchester hollow points which must have come from Walmart, some PPU stamped cases and 50 handloads with Hornady XTP bullets over what I assume was Power Pistol based on the flash.

And just to make sure that we didn't give the P10C an easy outing, the weather was 45 degrees with intermittent rain and mist. Fine Scottish weather. Mags were moist, the gun was moist, I was moist.

Again, just to make sure that I was being as mean as possible, I fired all the clean, new and easily identified stuff first. Then when and the old, tarnished and "what is this?" stuff last.

End result 1: 1 double feed on the aluminum cased Independence. Everything else worked perfect.

End result 2: Shooting 500+ rounds out of this gun in one go definitely lets you know about the grip texture on the back strap.
 
Load up some RCBS 9mm-124-RNTG over any charge you want. I guarantee you wont get through 2 mags.
 
The only thing I've found that could choke my CZ (which was a PCR) was, indeed, handloads.
Lee 125gr cast with the single lube groove, loaded much at all above minimum OAL, would wedge into the lands.
Switched to the 124gr with tumble-lube grooves, and the problem was fixed.
 
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