I'm building a .300 Win Mag on a Savage 111 action with a heavy sporter barrel. I have 2 scopes to choose from, SWFA SS 3-15x42 ffp and a SWFA SS 5-20x50 HD Opinions? Would you say the 3-15 is enough? Or Should I suck it up and hump the 5-20? P.S. This is going to be a dedicated hunting (elk and mule deer) rifle. Shots out to 600yds, 800 under the best conditions.