If your scope eye piece focus is not set 100% to relieve your eye, is that going to affect the accuracy of parallax range finding or it's just going to put strain on your eye, without affecting the accuracy of the range finding?
If you dont get the X-hairs in focus it will affect your range finding. Try this: Look at the sky, not the sun. Adjust your diopter so the X-hairs a nice and crisp, then focus on an object with the Para wheel. Say 10 meters. When you can see everything clearly, re-adjust the diopter to one end and look at the object again, you'll see that it has gone out quite a distance when you re-focus the para wheel, anything up to several meters out depending on the magnification.
Ok, why I'm asking this is because I have set eye piece focus first and by looking through it the hairs seems to be clear. Then I look at the target and set the parallax. The way I make sure the parallax is set is to leave the rifle on a steady bench and without touching it, I move my eye from side to side and up/down the edges of the view. When the crosshairs become steady and don't move at all relative to the target the parallax knob shows me 36 yards. Then I measure the distance with a tape and it shows 32 yards. Why there is such difference? Is possible that I have't set the eye piece focus exactly, thus affecting my range finding?
The 36y is that on the factory parallax setting. If so the scope setting are not that accurate. Measure a accurate distance and then focus you parallax and make new marking. Test to see if you can focus every time the same distance. Do that on all you distances and check it every time to make sure you new marking are accurate to you distance.
Are you sure your not using a "meter" tape? 32 mtrs is almost 36 yards. Why do you move your eye around? the idea is to see a nice round orb with the x-hairs in the middle, ideally your eye should be about 3 inches from the eyepiece ( eye relief ) to give you the clearest view but I suppose it may vary from scope to scope.