I think you made the right choice with the 7mmRM.
It's been my favorite chambering for a long, long time. It's not a one-size-killer-of-all-things-at-all-distances (nothing is really), but does a fine job on small to large-ish size game and from medium to longish ranges.
If you're only interested in the highest BC projectiles, it's important to not overlook the .30cal offerings. As previously mentioned, the 30cal also has high some high BC projectiles, but they are also scaled up in weight because the .30cal is a larger diameter (OK, I know that's kinda obvious...).
To get those .30cal high BC bullets to a higher velocity threshold (ie 3,000fps) without which their employment is questionable, you will have to use more powder and all of what comes with that. However, for that extra powder/recoil/muzzle blast you also get a commensurate increase in smack-down! This increase in velocity and smack down is often a welcome tradeoff for longer range hunting because of the wind-shedding properties inherent in the higher BC plus a higher retained on-target lethality.
For me (I already have a 7mmRM and it really is a great chambering), I've decided for my build to split the difference between the really big 7mm's (like the7mm Allen Mag, 7mm RUM, 7mm STW, etc) and will have a 7mm/300 Win mag chambering done.
Pragmatically, it really does come to what you plan on hunting at longer distances in conjunction with your personal comfort with engagements at those distances. Incidentally, that is an entirely different subject which is debated/discussed ad nauseam.