I never used a sub gauge I went straight to a gas operated semi. A fabarm, briefly, but you could watch the steel on the barrel rusting in the maimai. Then went to a Beretta A303 which I still own today (over 20 years later).
Never bothered with light loads either. Sure I wasn't out there shooting magnums all day when I was young but normal hunting loads were fine.
So what I'm saying is get a good gas operated semi like a Beretta and just use normal ammunition, it'll be fine.
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