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I just reloaded about 500 rounds of 9mm using Vihtavuori N340 (4.0gr) with 147gr Campro RNFP bullets and CCI Small Pistol Primers and once fired range brass (that had been fired through my CZ Shadow 2. I hadn’t had a chance to fire any of the rounds apart from a few rounds for putting them through the chronograph. Yesterday I was shooting my brand new CZ P-09 using those rounds and was getting a lot of double feeds (some of that is user error, I’m used to shooting a much heavier Shadow 2 and part of it could be breaking in the new gun), I experienced a few misfires at the same time, but was more focused on the double feeds. Today, no issue with double feeds, but the misfires seemed to be continual. At least 2 per mag (mag holds 10) and it was happening in both the Shadow 2 and the P-09. I have not experienced any problems with VV N320 which I am loading for my competition ammo also using 147gr Campro Bullets. I ran at least 50 rounds of Winchester 231 with 124gr Hornady bullets through the P-09 without any problems today as well. I am absolutely certain that each of the cases were loaded with the right measured amount of ammo because my process for reloading is as follows: brass is washed, dried, tumbled, deprimed, washed, dried and tumbled again. Then it is primed and loaded with powder. I keep a close eye on the amount going in and weigh every round before storage. I have narrowed it down to either a bad batch of primers, or the powder, but if it was the powder, then every cartridge would be misfiring. Unfortunately because I was mass producing, all the ammo with primers from different boxes have been mixed together. When I get a misfire I am racking the slide and ejecting it, but I wonder if I should be doing this in case it’s a “Hang Fire” situation? I am going to be pulling the dud bullets and see what’s going on inside. Any thoughts on this and is it unusual to get that many dud rounds or what might be the cause? Thanks