I recently bought a Sig P250, when i first got the gun, i did have problems with jamming like some other user's did.
When i went to the range for the first time, had four jams with 190 rounds of Blazer 115 Gr. fmj. Went back to the range the second time with 150 rounds of Blazer 115 Gr. fmj and had two jams, but this time i noted my round count and both jams were at 13 + 1. That being said, it was a problem with the mag and not the gun.
The gun shop offered to exchange the mag for another one, went back to the range with 100 rounds of Blazer 115 Gr. fmj, no jams.
My gun was manufactured last year when there was a big push to get guns out on the market, i think alot of the reliability problems with the P250 was due to out of spec mags.
If your having issues with a Sig P250 jamming, take a look at your mag. Note the round count when it jam's and write that down to see if there's a pattern.
My old mag was only marked with a 10 rd hole and had 12 coils on the spring, my new mag is marked with a 16 rd hole and has 10 coils on the spring.
My Sig P250 is great and one of the best pistols I've ever owned.