Last summer I purchased a Vortex Viper pst 4x16x50. I spent the time this winter to develop a load that my Remington 700 pss .308 really likes. I am loading 175 gr burger vld's in Hornady match brass, varget powder, and cci primers. The load is printing .310" groups at 100 yds. Vortex offers a ballistic matched turret for the scope if you provide them with your load data. I jumped on their ballistic calculator and figured where I should be shooting at various ranges out to 1000 yds. At 1000 yards, their calculator and my actual range results are about 4 minutes off. How do i go about making and proving data to provide them with accurate info to build me a turret?