Had the same ammo ruin the ejector timing on one of my Arrieta's. Cheap primers are the culprit. They swell during detonation...everytime. They swell so badly that they make it almost impossible to break open the action to extract the casings. I no longer shoot anyone's steel base ammo unless it's in an auto loader. Typically, Walmart also carries Federal 1-1/8 ounce loads in 7.5, 8 & 9's (Which have Brass Bases). IMHO it's far superior to the Winchester rounds...Never had any trouble with it in any of my fine double guns.
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