Home Forums Hunting & Shooting Hunting Optics How much will a 300 yard parallax setting effect a 100 yard target?

Acually it can be more than that. Or even alot more. That's because the 4X Leupold used in this case has a long depth of focus. But a 10X scope has alot less, so it's "parallax error" could be a quite a bit more.
The best examples I've seen are from the Leupold 6X42 on my .25-284 and the 7.5X AO scope I have on my .280.
The .25-284, with the scope set with almost no parallax at 300 yds. regularly produces 2-2.5 inch groups at 300 yds. But at 100 yds., the groups run about 1.2 inches.
The 7.5X AO however has a differently story. With it set almost parrallx free at 100 yds., the .280 would shoot .5-.6 MOA groups. But at 300 yds. w/o removing the parallax, it would shoot 5-7 inch groups. E