Everyone seems to be married to h4350. Yep it’s expensive. It must be ok because so many people preach its virtues. (Yes Sarcasm is intended).
I’ve had great luck with Superformance in the 6.5 Creedmoor, About half the price of h4350 and as a bonus, you get a good bit more velocity at no extra powder cost. Great SD’s and Fine accuracy. Everyone worries over temperature stability. I wonder if even that is a bit overblown since most who shoot for fun, and don’t use there target rifles for hunting, rarely if ever go shooting in extreme temperature shifts. It simply isn’t done.
So much for h4350 bashing.
As far as value, the 6mmARC, or possibly the 6.5 Grendel. Small cases but larger projectiles than the .223. Easier to spot hits/misses. I would have said, stick with the .223. Easy shooting and it is about the least expensive round used for precision shooting. Problem is, it truly is hard to spot the hits and misses at the far ranges. 6 BR or Dasher, good rounds for sure, but cases get a bit expensive compared to .223’s.
One more thought, strange calibers generally require costly reloading dies. Common rounds like the Creedmoor, .223 and .308 have dies that can be had for all but a song. That said, dies for these calibers run the gamet of costs. Some are inexpensive but some are all but in the realm of “if you have to ask, you can’t afford them” category.
As far as expense. Powders made by at the St. Mark’s, Florida powder company are going to be far less expensive than imported powders. St. Mark’s makes ball powders and as is known, ball powders have limitations. Still, besides Superformance, they make the Staball series which are worth giving a try.