I bought a new Leupold VX3 6.5-20 LR for my new 338 Lapua Imp I just had built. I have read that internally they are the same as the Mark IV. Will this scope be good enough for my long range shooting? I find myself wanting an NXS. I have Leupolds on all my other short and midrange hunting rifles. I'm a little concerned about repeatability on the 338. Anybody using the new VX3 on LR rigs?