I am going to order a scope from the Leupold Custom Shop this week, but need to decide between two of them. The fist is a VX3 4.5-14X50 LR and the other is a VX3 4.5-14X40 LR, both would have fine duplex and target turrets. My first question is what are peoples opinions on shooting 1000yds effectively with 14 power. The second is whether I should go with a 50mm or 40mm objective. Any opinions would be appreciated.