Who has articles and data on producing .41 mag launching a 240-250 cast at around 900? Yes, this sounds a lot like 1873 .45 Colt data. But I have a .41.

https://www.leverguns.com/articles/41data.htm

seems like an extrapolated reduction of the 231 loads for the cast 225 gr. at the bottom of the page might work.

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Ele era velho.
Ele era corajoso.
Ele era feio.

Sorry, can't help much with heavies at low velocity, never messed with it, YET, as I get older the less I like high velocities and recoil. A 230gr Keith @ 1000 fps is in the works using WIN 231 but haven't gotten to it yet. Best I can do for you is this......

In the old Lyman Cast Bullet bullet they list a 240 gr linotype using 15 grs of IMR 4227 for 932 fps and 6.9 grs of Unique for 879 fps.

Gunner

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https://www.instagram.com/41gunner/
41 Mags rule, Baers rock!

https://shootersreference.com/reloadingdata/41-remington-magnum/

Shows some heavy bullet loads 240 to 265 gr. but nothing mild. I've always been puzzled by the lack of less intense data for .41 magnum in the manuals. A very wise person once wrote that.44 special powder weights work for milder .41 loads.

This is a big help. I appreciate it much indeedy.