I bought a slightly used Sig Sauer P250 and ran about 200-250 Winchester and Remington 9mm FMJ target ammo through it. The kind that cost about $14 a box. I had three double feeds. I am fairly sure that I wasn't limp-wristed. I cleaned the gun thoroughly (perhaps I cleaned and oiled it insufficiently the first time out). I was thinking about two questions: 1) should I just switch ammo to the very type that I would have in it during a defense situation (hollow point Cor Bons or something) and pay the $20-25 a box following the assumption that perhaps my gun is ammo sensitive to the type that was in it during the double feeds and that before I take it to a smith I should just see how it shoots the good stuff. One little variable: I was using three magazines during a class, and I didn't notice which mag/s were in during the double feed. I also had some dummy rounds mixed in. Clearly I should note which mag is responsible if only one is present during another double feed. Could it be the gun - the P250? Should I just bite the bullet so to speak and take it to a smith to do some kind of reliability work on it? I would probably just shoot another 200 of hollow points, but that's $200 right there, and a smith might be $75. Final note: this is a compact frame - 15 round mags come standard. I bought a 17 round mag for the full sized frame of the P-250... could the spring be too aggressive or something? Clearly I can't have an unreliable weapon for defense purposes, so any insight ya'll have would be welcome.