I have been having some trouble at longer ranges with horizontal dispersion. This occurs even with little to no wind. Would getting one of those little levels for the rail possibly help my situation? I wasn't sure if it could be a canting issue.
I added one on my gun and found something interesting. What I thought was level looking through the scope, was actually canted a slight bit. My right eye "sees" the reticle as "level" but it is not. My left eye "sees" correct level or at least moreso than the right. I am learning to "trust the bubble" and it has helped my longer range accuracy/consistency.
once you have that squared away, mount the rail mounted or even the scope mounted level to the rig. now you know everything is truly level, and working in harmony.
lots of bubble level stuff here at the hide, do the google search on "ACD" "anti cant device" or even for "canting" or "leveling a rifle".
I have a USO rail mount. There's a misconception that you're constantly looking at it but that's just not the case. Once you check level once for any given shooting position, you take a mental snapshot of your horizon and don't need to check it every shot. An apparently level horizon can be off level quite a bit.
I too ordered the USO hindged rail mount and, because of Midway USA reviews, I placed the USO level on a 4' Johnson level to verify that the level was actually level. IT WAS NOT! I still have to contact Midway and have them send me another one. So we'll see if actually makes an anit-cant device that is actually level.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Halligan</div><div class="ubbcode-body">I too ordered the USO hindged rail mount and, because of Midway USA reviews, I placed the USO level on a 4' Johnson level to verify that the level was actually level. IT WAS NOT! I still have to contact Midway and have them send me another one. So we'll see if actually makes an anit-cant device that is actually level. </div></div>I found the same issue with mine. USO is ssending me a replacement but I'm going with the tube mounted unit this time. Its far more important that the reticle is level verses the rail and if a rail mounted unit is off even slghtly things will get magnified at longer ranges.
Put the uso level on your rail, set the rifle with the bubble centered. With the rifle held in this position use a plumb bob to get your reticle verticle and level, tighten the scope rings. Your rail level and reticle is now tuned. The rail level is really just a reference device.