I know this doesn't answer your question but; Have you tried a 240 gr SWC cast bullet with gas check. An inexpensive one is Lee bullet mould "C429-240 SWC" I don't think they are good in a Dessert Eagle, but otherwise they are non leading in Revolvers, pistols and carbines!
(I know you aren't suppose to use cast bullets in any gas operated system, But I have used gas checked bullets in M-1 Carbines since 1980, without any problems! And the M-1 gas system is as hard to clean as a D.E.!)
But 240 grain Lead SWC's are what go in 44's. Kind of an American tradition, like baseball, hot dogs, & apple pie!
For a Medium Velocity 44 Mag load I use 8 grains of Unique, WLP primer, mag brass and a Lyman 44 SWC bullet (No GC) out of a 2 5/8" 629 with very good results! I no longer have a 44 Special, but used the same bullet in a 3" Taurus in special brass!
Ivan