Comparing the two scopes is like comparing Apples and Oranges. The Nikon is that much better and picks up that much more light and has considerably better resolution. As a matter of fact in an informal comparism of the 2 I could tell no difference between it and a Swarovski PH 30mm scope at a fraction of the price(DNRSPORTS) its only drawback being its weight which is in the mid 20 ounce's as opposed to 17-19 ounces in most Euros. A heavy scope like that will also require sizeable rings and bases because of the inertia factor. Since I don't know what type Weatherby you have a scope of that size may or may not be a good fit for your rifle. Certainly in the case of an Accumark it would be a good fit but for sporter weight rifles I would stay with 40MM or so objective size. If your going to shoot game at relatively long range at dark or first light at deer you would need a large objective and a relatively powerful scope to get an exit pupil of at least 6-7mm or so at the range you'll be shooting at. If its going to go elk hunting or other western game a Zeiss Conquest 3.5x10x44,Swarovski 3.5x10x42 , Kahles 3x9x42, Leupold XIII 4.5x14x40 would fit the bill. The Nikons would be a bit bulkier to lug around in those conditions and would be not very scabbard compatible if you were to use one.