200's actually work very well.
Win Brass
200 gr Nosler BT, SBT, or AB.
H4831, work up to 78gr. 78gr =3k in a 26" barrel
H4350, I'm over 3k, but that's using some old data........ummmm...just work up to max.....
Both shoot well, with the edge going to the H4350.
Yeah, they work great in a 300