They probably will be okay provided they were stored in a cool dry place and are not corroded or damaged in any way. Right now the Corbon DPX 80 grain all copper hollowpoint is the best SD ammo for the P3AT. This load was practically designed for your gun and its 2.75" barrel. Buffalo Bore has several +P loads also, but I would be a little hesitant to try those in the P3AT. The pistol would probably take a light diet of them, however the recoil would be stout to put it mildly.