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I've had a 12 ga. Montefeltro for the last 10 years and have never had a single issue with shells. For Christmas I bought my son a youth model 20 ga. Montefeltro. On about 10% of the Remington field loads the gun will miss fire. The man. says that Remington changed primers and other manufacturers are having the same problem. Anyone aware of this problem? Is anyone having any problems with other loads? Thanks!