I have been using a MilDot reticle with a reasonable degree of success, but due to my eyesight not being as good as it could, have tried an alternaive method. On my scope, the MilDot is accurate at 10 power only. At 500 yards, 1 Mil measures 18"(as we all know). If I increase the zoom power to 19 (10 - 40 x 50mm), then that 18"on my target covers 2Mils. So, as the range increases, if I use that zoom increase with the appropriate calculations, will I still find the measurement of range just as accurate as if left at 10 power? My reason for asking is that over 500 yards, smaller animals such as Australian foxes are a bit hard to see well enough to accurately gauge the range. Zooming in will make a big difference.