Ive read the same about using low pressure 12 gauge data for the 10 but I never could wrap my head around that id be using a different wad and not sure how that would change things. I plan on using Remington hulls from PR. Not sure what primer they have in them (57 or STS). So you're saying I could find a low pressure 1 1/8 oz 12 ga load and use the poder and charge weight that load calls for and stuff it in a 10 gauge hull with a sp10 wad? What about filler? I know BPIs stuff is pricey but their 10 ga wads are cheaper than the sp10 by about $7! Also, alliants green dot data is intriguing as it is for a 3.5" hull and 1 1/4 oz of shot. Although it uses (6) 0.135" cards to bring the column up and its 1/8 oz more of shot than I want. That way I would save a step by trimming the hulls.
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