What is it? I've been using a 300RUM with 200ABs, have shot them with others, but I'm thinking of switching to a .223 this year. I'm loading up some ammo tonight for the spring hunt.
What's the best caliber and load?
Also, how old are you and how many elk have you shot? - just so I know if your opinion should matter or not.
Finally a serious hunting thread!
The 223 with 70-90 grain Sierra Matchkings should be good out to 300 yards ... even out to 500 if you keep the bullet in the vitals. Drill the HP out a bit larger for expansion at long range. I also fire harden the base of the jacket with a torch for controlled expansion at close range. I would advise getting a tighter twist barrel to increase bullet revolutions so they penetrate deeper. If you increase the revs with a tight twist and have a high BC bullet they will out-penetrate a TSX or a solid--especially if you use a moly coating on them.
Additionally the high BC will keep them in straight line penetration even if they tumble. I've never seen a bear yet that walked away from a hit with this combination.
Since you have the reach with this rig, I would consider a 6x18x50mm scope with target dots and target turrets as this will give you the greatest range and hunting hours flexibility. You can get the dots set for the 100 yard increments use the turrets to compensate for the yardage in between the 100s. The center cross-hairs should be heavier posts for close range low light shooting and the dots should be small for long distance shooting. I would use see-thru mounts in case its foggy in the valleys in the early mornings or if you get a shot that is too close for 6x.
I would use camo tape on the muzzle, a point often overlooked for still hunting, as the muzzle is the first thing the bear would see. I always use a scent-lock Ghillie suit in case of a charge as they won't be able to locate you and will give you the time needed for a follow-up shot.
As for my experience--I have shot truckloads of "elk-class" game.
Let me know if you need any further advice.