OK, I normally shoot winchester white box 115 grain HPs in my CP and it digests them without a problem. But I cannot pass up a sale, and a local big box retailer was getting rid of Hornady Zombiemax ammo pretty cheap. I tried some and my C9 acted like a cat coughing up a furball. It isn't the mag because when I loaded up the WWB 115 grainers next, the C9 ran wonderfully. I'm not interested in taking a dremel tool to the gun for two reasons: (1) there are some pretty smart machinists and engineers at Hi Point making these pistols and they know more than me, and (2) as Clint Eastwood said, "A man has to know his limitations." I'm not a gunsmith--give me a gun and I can reassemble it--just don't expect dremel tools, torches, drills and such out of me. That being said, it's a free country, and if you modified YOUR C9, I'm cool with it. But I was wondering....anybody have problems with Zombiemax in their C9? Zombiemax makes good plinking ammo by the way...the groups are tight...probably because my C9 becomes a single shot pistol with them.