Ok, I guess I’m just having a hard time wrapping my head around how you did your test. You said that you sighted your scope in, not sure at what range, but then when you shot it at approx 96 yards it was 2.5 inches high, and this makes you think that your base has a 6.7 MOA slope to it. I'm not following you. If the bore of the rifle is completely level with the ground and given a flight time of approx. 0.107 sec to the target (that is assuming that the round is moving @ 2700fps and not factoring in that it has slowed to around 2500fps at 100yards) the bullet should drop close to your 5.8 cm figure (that also assumes that the target is completely level with the bore of the rifle). The factor that seems unclear to me is if your scope has been sighted in how do you know that the crosshairs are in the exact center of the scope tube? There are simply too many variables involved( any variance in the ring heights, centering of the crosshairs, scope tube straightness, etc.) to say that the base does not have the right amount of cant. I would think that a more accurate way to measure this would be to shoot a laser down the bore of the rifle, and then another laser from the top of the base and measure the difference between the two at your 96 yards where a MOA is for all intents close to 1 inch.
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