I am looking to build a weapon strictly for elk hunting for yardage up to 850-900 yds. I am a avid bow hunter that does not have much experience with bigger caliber rifles. What do you guys suggest for a caliber and why? I am plan on using a nightforce 5.5-22x56 for the glass. I reload my own ammo and have the time and space to work on loads for the weapon. Any help would be greatly appreciated. Thanks in advance for your advice!