I've been reading some of these posts concerning squared up scopes and canted rifles and I'm wondering if any of you guys have actually done any shooting. The cross hairs of the scope MUST be square to the bore if you want your scope to track true from 100 to 1000yds or beyond, period. The rifle MUST be held level when firing it at long range. You do what you have to do to make sure it is level, or don't pull the trigger and waste a bullet. Cant your rifle at close range, not a big deal, you move POI only a inch or two. Cant it at 500 or beyond and you missed the target. A slight cant at 1000yds will take you from the X ring to the 9 ring with a .308. The more drop your bullet has the more effect a cant has. This applies to both iron sights and scoped rifles. It's easy to hold level off a rest or bipod, you must hold back against the tendency to cant when shooting prone with a sling. It may not feel comfortable but so what. What's more important comfort or hitting your target. Practice keeping the gun level and you will be able to keep it level. Sure a adjustable butt plate helps but not every rifle has one, a M1A for example. Verify the rifle is level before you pull the trigger. Its not that hard. There are a ton of variables going against you hitting the target, wind, slope, spin drift, Coriolis effect, etc, so why would you allow one more by having a canted rifle?