i just bought a ruger p345 at bass pro shops. went to the range with 100 rds of 230gr practice ammo and noticed that the last bullet in each mag (2) would not feed and caused the gun to jam. any ideas as to whats going on with this? it holds 8 rds in the mag and 1 in the chamber. if i put only 7 rds in the mag it feeds fine. i've cleaned the gun prior to using it and during using it.