It could be any or all of the above. However, since you say the Remington rounds cycled with no problems, I think that limp-wristing can probably be eliminated from the equation. It could also be that the gun was getting dirty enough to cause the problems. My P-3AT will start to exhibit failures after 40-50 rounds if I don't stop to clean the chamber. It could also be that your particular gun just doesn't like Fiocchi. Did you fire any of the Remington through it after the failures?