As a further refinement, rimfire shooters (where you can't "tune" the ammo).... tune the barrel using a movable muzzle weight.... Not only do they tune for the top of the "upswing" of the muzzle, but they refine it so that with the lowest velocity shots, the barrel is at the very top of the swing (or nearly so), but has not started back down.... Then shots having a slightly higher velocity arrive at the muzzle just a tiny bit sooner, while the barrel is still travelling upwards, so they are launched at a very slightly lower angle.... However, since they are going faster, they have a slightly flatter trajectory, and hence drop less.... The start out "aimed" lower, but fly "flatter", and if everything is timed just right, they all arrive at the target with a narrower vertical spread....By carefully adjusting the mass and position of the weight, it is in theory possible to "tune out" the vertical dispersion due to ES at any given range.... There is no reason that we shouldn't explore the same principles with an airgun.... Note, the adjustments required can be just a few thou.... and you may find many different "sweet spots" and have to sort out which of them is the very best.... It can be time consuming, but in theory should be worth the effort....Bob
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