You're more patient than my girl and I are, Firewire. We had nothing but trouble with the Federal 550 bulk and gave up after about 75 rounds. She had failures-to-feed in every magazine because the little lip those rounds have around the bullet would catch on the sides of the chamber on the way in. They were also very inconsistent when they did fire, and were absolutely filthy. There would be a big brown puff of stinky smoke and residue all over (and inside) her P22 after shooting them.I thought I'd try the Fed 550 bulk and consistent problems. Finished off the box after a couple of range trips. Just grinned and beared it.
We thought it was just new-Walther break in trouble, but the problems never went away. So we just gave the rest of the box to a couple of guys at the range who had a Ruger MKII. That gun really will eat anything. I know because I bought one a while ago and it's my range gun, as well as the perfect zombie gun. I've shot 50 year old cartridges through it that were corroded and flaky with age and it sent them on their ways with no problems.
I'll try some mini-mags for her P22 if I can find any around here. I've yet to find any, but at least I can get the Stingers. They're expensive compared to bulk but they're worth it. Powerful, accurate, clean, and reliable. Did I mention the muzzle flash? That makes them worth the cost even more!