I feel your pain on the availability of .358 bullets, but here's search results on the Hornady 200 Interlocks, that shows pretty good availability and I had 100 of them arrive on SAT with the 100 180 grn XTPs I ordered.
https://gun.deals/search/apachesolr_search/090255235104
Graf's also has the 200 Interlocks in stock (that's where I ordered from):
https://www.grafs.com/retail/catalog/product/productId/6315
Hornady appears to be the only manufacturer to step up production to meet demand. They're kind of expensive, but when you factor in you're getting 100, it's slightly cheaper than some of the premium bullets, which IMHO are sort of wasted on deer. The .358 rifle bullets should cost at least a little more due to materials. Every review I've read says that the 200 interlock will "get the job done" at least on deer and hogs. And Hornaday loads it in their 35 Whelen and .358Win ammo, which also gets good reviews. It's not got the highest BC going, but for a couple hundred yards it isn't going to matter.
My .350RM drives these at 2830 with IMR4320, and should easily get 2900 with TAC, that gives me 300yds easily with 8" drop from a 200 zero. They shoot "OK" in my M7:
View attachment 1104212
For practice out to 200yds I'm going with the 180 XTPs, Graf's has them for $26.99 per 100, which makes for cheap .350RM plinking ammo.
Honestly right now isn't the best time to find any favorite hunting bullets, not just .358. I've got a bunch of standing notifications for Nosler and Barnes in:
6.5
.270
.308
.358
and I'm not having much joy. Luckily I've got at least 100 of each on hand, but it doesn't allow for a lot for practice. This is where the .358 might excel due to the handgun bullet option.