I SERIOUSLY doubt that 34 GRAMS is the powder charge as opposed to the shot charge. Even 34 GRAINS would be a whale of a charge
34 GRAMS is a 1-1/8oz load
Shotgun hull length is the FIRED length. 70 is 2-3/4, 65 is 2-1/2, 60 is 2"
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In other words, is there some kind of potency level I should stay below in order to not run the risk of damaging this little piece of family history?
If so what is the way of identifying this level?
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The 16 should have proof marks which will state pressure, maybe payload, and hull size