Been looking at 3x and 4x Trijicons. I shoot gong targets out to 600 yards now with a Colt 4x scope with no problem. Have those of you with models such as TA11F, TA31F or RCO with the red trianlge chevron, the TA33-8, or the TAO1NSN had any experience shooting gongs or metal targets at this distance? The TA01NSN is ideal given it's rectile but the eye relief is short and for me to get a proper sighting that scope is bout 3/8 away from my eye glasses, a bit close for comfort.