Mr. 16 gauge,
Since your trade gun has no rear sight, it is a simple matter to have a competent gunsmith fit one via a dovetail.
Heavier charges do not always give one a higher point of impact, at least not in some of my guns: they shoot lower. I suspect it is because of shorter barrel time and flatter trajectory. I'd bench test a heavier charge and see where it impacts after I had a rear sight to line things up. Hope this helps.
Adam
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Adam Helmer
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