Re: how far will a 300 ultra mag shoot with a vx3?
victor, you asked the question in the wrong way.
To answer it yourself, do the following.
1) work out how much elevation your scope offers
2) work out how much elevation you need to get your projectile to whatever distance you want (eg, 1000 yards)
3) determine if your scope has enough internal elevation to get you there
If NOT, you have the following options
a) purchase a tapered base to add more total elevation (eg a 20MOA one piece base)
b) use your reticle to determine hold over points (if your reticle is not just a stand cross, or post style reticle)
c) Purchase a scope that has tonnes of internal elevation, such as a nightforce or loopy mk4, forget the calculations and just buy something that will get you where you want PERIOD.