I have a Rem 700 in 300WM, 24" factory barrel. It is older but I bedded it and it shoots great at least to 400 yards( longest range near me. I have been shooting the 168SMK over RL22 and IMR4350. I can't tell any difference on the accuracy or the recoil per say....but I want to buy a big barrel of powder 8lbs or close. The books I have Nosler #5 and Sierra book list the IMR4350 as taking less powder to achieve the same velocity....does this make better sense to use? Is it a faster burning powder? And would I be better off to use the faster powder in my shorter barrel? I also was offered some IMR4831 for very cheap I see this powder is listed for alot of cartridges but have never tried it. This IMR4831 is cheap because it was stored in a clorox bottle and is about 10-15 years old.....I trust the father and son that have both used it to load with but they just will never use it so with as much as I shoot paper and steel I could use that powder if it is still good.
The bullet used for Roosevelt Elk will probably be the 180NAB or the 200NAB. Proably end up limiting my self to 700 yards in prime conditions.