Try the figures I gave you above, I'll bet they are awful close. With the figure's Winchester gave you, you have a 100 yd zero and50 fps more velocity, that won't make much difference over 300 yds.

The price of that ammo, I sure hope you have a lot of money or are taking up reloading! 30-06 ammo cost's about 1/4 the price and kill's animals only a bit less dead. I hadn't realized that stuff cost that much!

If you can find someone with a cronograph, you'll probally find out the vevocity Winchester gives is not quite right. To many different thing's effecting it.