I was pretty much in the same boat a couple of years ago. I ended up going with 124 grain. For your use the 115 or 124 would be more than good enough. Whatever you can find the cheapest, in stock and in bulk. I haven't used them myself, but Rocky Mountain Reloading is often recommended on here as a good source for bulk bullets. I'm still burning through some Xtreme bullets I bought before seeing the Rocky Mountain stuff.
https://www.rmrbullets.com/
