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Without more detail, it is possible barrel length may be a factor here. Modern 22LR ammo seems to get peak velocity at around 10-12 inches down the barrel and after that the friction in the rifling...

Buzz

One thing that I cannot see here re Objective focus is that it is more noticible on higher magnifications. At low magnification like 1-4x there is little effect of parallax, but wind it up...