I got my 29/6 1/2" in late '67 and started the first loads from a then new Lyman #43 manual. The load I settled on was a hard cast Lyman #429244/255 gr. SWC-GC sized to .429 and lubed with the original Allox/beeswax formula over 13/Unique (my #46 manual lists a max of 12.1/Unique for that bullet). That charge remains my magnum load, recently chronographed at 1275 fps, it may be a little too hot for the 29 but I've shot a lot of 'em.
In the early 70s I and a buddy used to plink beer cans tossed into a fast stream and waited till they got about 75 yards away, few lived passed 85 yards (yeah, I know but that was before anyone thought much about it).
Thing is, with a moderately hard alloy and good lube I just never had any leading problem nor did my friend with a simular load in his .357 and they shot great at magnum velocities.
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