Green dot works well for pistol though it isn't all that common because it doesn't meter naerly as well as other powders. You would probably need a chrono to see any difference in velocity when using magnum primers vs standard. As always start from a reduced load but if you see no pressure signs working up to max, go for it.
Back when Alliant published a load for green dot in 44 magnum using a 240gr jacketed bullet the max load was 8.7gr max for 1190fps. That load, like so many others, was dropped in 2006.
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New gun, same ol' shot.
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