Re: 264 WM bullet choices
Yes, I'd agree that Remington does seem to have some difficulty understanding "versatility" in setting their twist rates. Once they decide a certain cartridge is best with light bullets, that's that.
Stability is just as dependent on velocity as it is actual twist rate, and twist rate recommendations are generally given for the median velocities we'd expect that bullet used with. At the velocities I'd expect from your rifle, you may even be able to stabilize the 140 A-Max or SMK.
The Berger 130 is likely going to be a good choice, if not, then the 120.
For target work, you might try Norma's 130s. I'm having very good success with them in a .260 and am getting ready to do some testing in a 6.5-284.
For hunting smaller critters, like varmints and whitetails, I used quite a few Nosler 120 BTs in my 6.5-300 Wby. They shot very accurately, held up to the velocity (3,500 fps) just fine and were very effective on game, albeit a little destructive.
The beatings will continue until morale improves.