I have tried the Lee 200 gr boolit. It comes out of the mold way to small. About .427 to .429. My 44 Malin I bought new in 1977. I shoot mostly Lymans 421429 as cast with ww, AC or WD. both worked well.
I also found that the Lee bullet was to short. If seated to the crimp groove it won't feed from the tube up to chamber. Seated out to the lower lube groove it feeds fine.
It just won't shoot.
I think if I had a 200 gr bullet that came out of the mold at .433 it would shoot much better.
Leo