I am going on a Mulchatna Caribou herd hunt with my father in law the end of next week. My dad is loaning me his 300 WSM Weatherby Vanguard for the hunt because my 308 needs a new scope, and my 300 Weatherby needs a new trigger and needs a scope to be mounted. I have order scopes, a scope mount, and a timney trigger. None of them will get here in time for me to install them and sight in the scopes. So what grain 300 WSM bullet should I use? Right now I have a box of 165 grain and a box of 180 grain. I have done trips to the range with both. I am leaning more towards using 165 grain ammo because my dad dropped an elk at 350 yards using 165 grain ammo with the rifle. I am planning on getting hopefully three more trips to the range before I go so I can sight in the rifle and get some practice before I go. Also, if I am unsuccessful I am probably going to try again in December when I head out to Dillingham again for Christmas. By then I should have my both my 308 and 300 Weatherby both good to go. Which would be a better option for Caribou?