Don't listen to these guys a 165 grain is a good round for both,it's not that goats are hard to kill they are rather easy to.I would be booed I guess for killing them all with 180 out of my '06.I even used a 300 ULTRA MAG-O MY GOODLORD-.What you wan't is a good load that can strech 350+ on those goats,also remember they look alot farther out there than they are cause they are small(90 lbs for a big one).Most of my goats have been shot under 200 yds than over.They are fun critters to hunt,Mule deer it works good for them.

Take that "06 sight it in for 2.5 high at 100 yds,work up a good load 165gr Boatail, and have fun.
I live in Montana also.
BBJ