I am new to long range shooting and would like to become proficient out to 400-500 yards on elk deer and black bear. I live in northen idaho so the terrain varies alot from thick timber to open glades and clearcuts. I often encounter shots from 20-500 yards on game. I just bought a remington xcr 338 win mag its totally stock and has a 26 in barrel, and i am shooting hornady 225 sst's propelled by 70 grains IMR 4350 roughly going 2800-3000fps. for optics I have a nikon monarch 4-16-42. Is this setup adequate to take game out to 500 yards if I do my part? I was also looking at getting a stock somewhere in the $300 range and I was wondering if a tactial style stock with the vertical grip would help improve accuracy. Whats the science behind it? does it cause for you to have a better more comfortable grip from the prone position, and how are they to shoot offhand because I encounter short range shots too. Thanks for the help i need all i can get!