The short barreled 1911s are known to be rather finicky on ammo so one must shoot a lot of it with out problems (at least a couple hundred rounds) before it can be trusted. I had a Springfield Ultra Carry which was their version of Para's P-12. It digested most everything 185 grs and over without a hitch though the Speer 200 gr hollow point had problems at first. Another problem with the short barrels is the lower muzzle velocity can have a negative effect on a bullet expanding as planned. This can be overcome by using a lighter bullet (but may have feeding issues) or go with a more reliable heavy bullet that may not open. My carry ammo was Remington 230 gr Golden Sabers as they never jammed and I was satisfied with their performance when called on to put down injured deer. The Hornady XTP was also reliable but I found a great deal on the Remington so ultimately went with them. The greatest problem I found with the ultra compact 1911s is that they need to be cleaned regularly for most reliable operation. I did nothing special in cleaning, a brush with solvent followed by a jag with patches is all that is needed. I use Break-Free CLP as my lubricant as I feel its combination of lubricant and cleaner allows for fewer problems. Others have their preferences which work well for them. I guess it is something one must find on their own.