Perhaps a bit of a dumb question but I just purchased a new "long range" type rifle and I'm starting to research ammo.

I'm not a reloader so was looking for some advice into the best factory ammo that for that application.

The rifle will be used for a Stone sheep hunt, but mostly for deer and elk here in Montana.

I'm pretty new to this long range stuff so pardon my ignorance, I'm just trying to get my feet wet slowly and make informed decisions.

Thanks in advance.

Chris