Hey guys here is some info from Spott Hog:


Does 3rd Axis Leveling Really Matter?
Since the development of our shooting machine, we have done a tremendous amount of research in the areas of forgiveness and accuracy, and have discovered a lot of useful information.
In the area of accuracy; we’ve discovered that by using a level on our hunting sight we could increase our accuracy. Now, in past years we tried using a level because it made sense, if we could hold our bows at the same angle every time we would get more consistent results. At first, on flat ground, we seemed to be grouping better. Yet, on uphill and downhill shots we continued to get left and right arrows. We quickly realized the level could lie, but why? Freestyle shooters had been using levels as a standard piece of equipment, seemingly, without problems.
So we dug deeper, and discovered 3rd axis leveling. That is; if the level is orientated properly, with respect to the bow and the path of the arrow, then the level is very useful. The standard approach to leveling the 3rd axis was to use a bench mounted leveling fixture, this ensured that the level was perpendicular to the riser. So we decided to try this.
The results: On flat ground we were deadly, however, we continued having trouble with left and right arrows when shooting uphill and downhill. It wasn’t really bad, we just figured our form needed some work. But, as time progressed, we realized working on our form wasn’t fixing the problem.
So, we decided to check it with our shooting machine. We found that, at full draw, there was torque in the bow. This was caused by the pressure exerted on the cable guard and the way the load transfers from the string side to the cable side of the cam, the riser actually twisted in relation to the path of the arrow. Add to this any hand torque and the level is no longer perpendicular to the path of the arrow. Our shooting machine showed us that if the level is not aligned perpendicular to the path of the arrow, at full draw; the level will lie. So, we adjusted the 3rd axis, at full draw, and found our level had become a very valuable tool. Those bothersome left and right arrows were no longer trouble on the uphill and downhill shots. Yeah, we still miss a lot, but at least we know the level is truthful.
We also discovered why freestyle shooters don’t seem to have the same problems with the 3rd axis. Now don’t get me wrong, they still have to level their 3rd axis. However, the equipment they use, by design, naturally stores less energy and therefore has less torque; a longer axle to axle bow and larger brace height puts less pressure on the cable guard (which helps the torque factor), along with cams that don’t have such an extreme change of loading from the string side to the cable side of the cam (resulting in less limb torque). Bowhunting equipment stores more energy and has more natural torque (by design).
In conclusion: we found that if the 3rd axis of the level is adjusted properly, at full draw, which takes into account the torque of the bow, then the accuracy of any bow is greatly enhanced. Try it, you’ll like it!
Good Shooting!