Success!
Loaded 100 rounds today. Sized to .358, lubed with LLA. These bullets were lubed a few years ago but never sized. The lube was a bit thick in spots and crumbly. Load was 4.5 gr HP38 in 38 special brass with a CCI small pistol primer.
No leading at all. Wife was a bit off today so hard to say if it shot better. I do know the 18 mag loads with the MP359640 HP shot way better than before. Most in 2" at 10 yards offhand, before it was as more like 5".
These photos are of the forcing cone. I ran a single wet patch thru the bore followed by a couple dry one. No brushing at all. Other than a dry spot about 3/4 down the bore towards the muzzle it was a smooth, easy push. That dry spot went away with a few strokes of the patch. No lead was seen on patches.
This was a very worthwhile exercise!