Bart B., you aren't the only one to observe that a weak firing pin can open up groups, I've not seen it myself (don't shoot Palma though). A weak firing pin spring can delay ignition by a few milliseconds, which is time for the shooter to wobble. I know of a couple Palma shooters who replace firing pin springs before the start of the season.
Jimro
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Machine guns are awesome until you have to carry one.
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