Opened mine last night for Christmas (I had test fired about 200 rounds a few months ago with some minor problems).
Today I fired 75 rounds of CCI no problems. Fired 75 rounds of Federal bulk with no problems. Then I started firing 25 CCI and 25 Federal bulk. It began jamming, FTF, a few crushed rounds, a few jammed in the mags. For the next 200 rounds I kept having a few jams, FTF etc.. I was starting to worry. Also It seemed like it would not shoot accurately consistently.
Then it quit having problems! I don't know what happened but it started putting every round down range. I have a SIG Mosquito that took a lot of rounds before it started working consistently and it may have just needed "broke in". I tweaked the scope and got the accuracy back on. I burned through another 350 rounds hitting targets at 25, 50 and 100 yards with pretty fair accuracy. Sure needed a good cleaning which was easy. Mines a keeper. I better buy more ammo.
NOTE: Overall mine liked the Federal Bulk better than the CCI (better for me because of the price difference).