Does anyone have any advice on a good scope and mount for this platform? I'm still using iron sights on my AR-15 and my only scoped rifle is a bolt action .308. I was thinking maybe a Vortex Viper 4-12 or maybe something with a higher level of magnification. Trying to stay in the $500-$800 range. My main use is punching paper out to 300 yards. Thanks for any and all advice.