After extensive testing with various ammunition we have concluded that all remaining key-holing issues have been isolated to one particular brand and weight of ammunition. Unfortunately this seems to be the most common and available ammunition: CCI Maxi-Mag 40gr.
The 30gr and 50gr varieties of CCI shoot flawlessly, as do other brands of 30gr., 40gr., and 50gr. ammunition. For some reason, though, it seems that the 40gr. CCI Maxi-Mag in particular still has sporadic key-holing. At this point in time we have deemed it ammunition specific and recommend trying a different grain or brand of ammunition if your PMR-30 is still continuing to key-hole with an updated barrel.
- They've fixed the chronic key-holing with a new barrel;
- They sent me a proper barrel instead of an older version;
- A 10% key-hole rate for one specific kind of ammo is quite acceptable.
On the other hand, CCI Maxi-Mag 40gr was specifically recommended in the literature that came with the pistol. While I understand not wanting to change the manual for something like this, the fact that this card was included in the case bothers me:
Come on, guys. If you're going to include a "Oh by the way" card, you need to get your information right.
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