Interesting Clarky - however consider a little breeze that moves from 2-3 to 4-5 mph (and that's not much breeze) moving left to right and then vice-versa - well then at 45 odd yards you have about an inch and 1/2 left to an inch and a 1/2 right - which in such a situation gives 3 inches of potential eddy and miss/wound potential that although improved by better pellets remains pretty darn close irrespective of .177 or .22.

Sub 12 unless its really still or the breeze is constant I think it's too much of a crap shoot much beyond 35 yards and a lot less in some situations.