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.

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.