All lead lubed bullets need a crimp. There is little friction between a case mouth and a cast lubed bullet. You lube a cast bullet to prevent barrel leading by reducing friction, that lube also reduces friction in the case mouth. Revolver and rifle ammo needs a roll crimp. Semi-auto pistol needs a taper crimp; 380 acp, 9 mm, 40 S&W, 45 acp and similar cartridges.
Powder coated bullets should probably be crimped, but I have no personal experience with PC. At age 70, I have enough bullet lube material to supply my grand children. I got very tired of buying lube sticks for my bullet sizer. I didn't realize how much bullet lube an 8# block of bees wax (I bought 2 blocks to save on shipping) and a quart of liquid Alox makes. Three 3# coffee cans is a LOT of bullet lube. That was the first batch with 1 beeswax block.
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S&WHF 366
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