Happy things worked out for you. Obviously your loads functioned well and no issues arose. Running a couple hundred factory rounds through is a sound practice, but it's not the only way to go. Since you did not report any failures to feed or failures to eject you should be good to go. Actually I've found the .380 an easy round to load.Thanks for the replies, and I guess a reflection of both thoughts I was having myself. I had plenty of brass and primers/powder, so I stopped by Bass Pro after the LGS and picked up the dies and bullets. I had the thought of factory cartridges to test/confirm functionality and to eliminate all manufacture ability to blame the ammo. I also saw the price of factory ammo as I was holding the dies and bullets. I had no idea .380 was at or higher than .45. Needless to say I came home and spent a few hours at the press before heading to the range. I am happy to say I found a winner right out of the chute and couldn't be happier...was also able to take my wife and twins to dinner with the money I didn't spend on factory cartridges which was a bonus.
The only thing curious were a few ftf. It was always the first or second round, every other was flawless. Upon inspection of the "dud" cartridge one could see a very light, off center, dent in the primer. Just to scratch an itch I loaded the final mag of the day with the handful of ftf's...each one went bang on the second go. I have NEVER had that with any caliber or load I've used so I can't really say what the problem was...Happy things worked out for you. Obviously your loads functioned well and no issues arose. Running a couple hundred factory rounds through is a sound practice, but it's not the only way to go. Since you did not report any failures to feed or failures to eject you should be good to go. Actually I've found the .380 an easy round to load.
Maybe, I've never had the issue before, but this is my first go at .380. Interesting/coincidental that out of 12 mags of 8 all, 5 of the ftf's were either the first or second in the mag and the pin strike was off center on each. I don't know how to post photos or if I could even find any of examples in the bucket of brass, but imagine a very light hit at 1 o'clock, literally at the edge of the primer, followed by the familiar large dimple at dead center from when the round fired.Sounds like those primers weren't fully seated. The first firing pin hit seats them and the second hit fires them.
I did not give these rounds the plunk test. No explanation as to why I did not, but will on future rounds to confirm/eliminate as the issue.With that pin strike being way off center, a headspace issue, perhaps? Do the rounds all reliably pass a plunk test?