Unless I missed one while scanning those Midway pages you linked, the only bullets of .358 are lead; no jacketed bullets are. The oversize lead bullets swage down in the bore for good gas sealing. Jackets are harder, could cause pressure problems.
If you ever try to load an heirloom .45 Colt for accuracy, you'll have fun figuring out which bullet to use of the wide range of sizes possible! Tolerances were larger in the old days.
(Others will know far more than I about the fine points of matching bullet to bore.)
PS- I hope Midway did due diligence. They are one step away from the manufacturer- have a care from whom you get your tech specs.
Ah, that makes sense, I got it, thanks for all the replies.
