I have recently purchased a Remington 700 XHR 300WM rifle. I haven't had an opportunity to shoot it yet, and was looking for some advice on ammo and accessories. I have a pretty good Nikon 3x18 scope, but I'm gonna need a bi-pod. Most of the ammo at our local Gander Mountain seems to be 150 grain, unless you go for the $65/box stuff. Also, up until now, the largest caliber rifle I've shot was probably that M-60 I played with back in the late 70's. Anything I should know before I squeeze the trigger?