As Lefty7mmstw said, it does depend on the rifle, every barrel has it's own ballistic personality, and more so with a standard production rig. Where as a good builder can just about nail your preference, from an accurate barrel burner, to a 1000 yd. competition rig. Sorry for drifting off topic there.
But as for powders, I started with IMR-4350 when I began loading high powered rifle 30 some years ago, and granted I achieved some excellent results with large worked up compressed charges IMR4350, I also managed to get kind of tunnel visioned for a good 10 yrs.. In fact it a few years after I had been I started loading for the 7mm RM, I finally decided to give RL22 a try, as I just wasn't getting the velocity out of 4350 I had come to expect from the 7 mag.. That was an eye opening experience, and lead to me sampling different powders that fall into my slow burner mentality. RL22 is probably my absolute favorite powder for most of the cartridges I load. With some exceptions regarding .270 win, in which I like RL19, however RL22 meets most of my needs with exceptional predictability regardring pressure, as well as velocity projections.
As for pushing 165's to 3K fps, I insist that, if your barrel hasn't been shot out, or didn't get slightly over bored when manufactured, that if you run a powder like like IMR-4350, you can get awfully near, if not reach 30000 fps, and do it quite accurately if the barrel will shoot well. As a new member I ask that you please excuse my forward approach to this, but I have an exceptional amount of experience working with this cartridge and many different actions, including an M98, Douglas, 3 stage jewel, pillar bedded Carlson stock. You might say I have a special place in my heart for the often under rated 30-06. Now I know the 06 isn't a 7 mag, but it can definitely produce exceptional performance plenty capable of taking a bull elk with confidence with the right approach, regarding reloading.
So with that said, I would specifically go buy some 165 gr. Hot Cores, if you can't find those, grab the Deep Curl, they are a superior bullet for the intended ballistic and hunting purpose here. Of all the powders I've now worked extensively with, iMR-4350 still remains the one I can push hard enough to get exceptional velocity and accuracy from. Superformance is also a good one, but it's difficult to find when I need it, so I don't use it often.
The Following includes load data that is either at maximum published data, or may suggest doing so. Never attempt to load a cartridge at a maximum charge without having followed proper load development procedure working up from minimum.
My top performing load from a bare bone 700 ADL, floated barrel, was something I had very similar results with in multiple other rifles, Savage's, Ruger's, other Remingtons, and a couple custom rigs, as follows:
165 gr. Speer Hot Core
I seat .010" off the lands, which has been an accurate oal in most of them. I have found the Hot Core to have very consistent olgives, so I don't think your going to have a problem with some touching the lands, while others may be significantly more than .010" off the lands. Also make sure the throat at least is very clean so you can get a good olgive to lands measurement.
Brass- It's essential to use matched head stamps, I like RP and Win. but have nto had a negative experience with Fed either. Trim them all to the same lengths, and if possible try to sort them by weight. Sorting by weight isn't absolutely necessary, but those with a big + variance can produce much higher pressures when working at max charge. Also, use fire formed brass from your chamber and if don't have a neck die, only size the body, don't adjust the FL die all the way down to the shell holder, just enough to size the neck, if possible.
Primer- I have used CCI-200's and 250's, but I prefer the 250's for lighting up large compressed charges in this application. I'm sure there are other acceptable primers, but my second choice would definitely be Win. they are good. Federal's are known to be softer, so I don't use them, as I had problems with them failing with high end pressures, and we are talking about working on the extreme upper end of the load tables. Make sure you seat the primers with good positive contact with the bottom of the pocket, this is to further prevent any gas leaks.
Powder- IMR-4350- Charge I have worked up to can't be published here. What I can say is since we are seating only .010" off the lands, start just below mid table and continue working up in reasonable increments until you have reached the visible sign of maximum. When you begin to feel unusual resistance when lifting the bolt, you have reached maximum. But don't forget to glance at the primers anyway, cause blowing primers can also be an indication of excessive pressures, if you blow more than just one or two from the same loads.
I sincerely hope this helps you harvest a good bull. I am currently getting ready to engage in a spring turkey hunting fest with one of my adult sons. I promised him a turkey hunt of a life time when he returned from Afghanistan in 2008, but he has been busy, but we finally reached our goal. But I do know the 06 well, and I know if developed properly, it can function as a very effective long range cartridge, and with the potential of slightly better than average results.
Now get to developing, but that;s the fun part anyway.
MB