Whatever ya wanna shoot that’s safe ‘n undamagin’ is reasonable. I’ve used 170 grain Keith’s (Lyman 358429) on many occasions until I decided it was a waste of lead.
Leadin’ can be caused by several things. My Rugers would lead with the same loads my Ubertis would eat all day without leadin’. Just an example.
As Will has, I’ve been told awful things about Moly. All I can prove, thru experience, is the use of a Moly based lube on my home-cast bullets cut the leadin’ in the aforementioned Rugers to next to nothin’. No loss of accuracy or objectionable residue left in the barrels.