Regarding the loading tap concerns, all revolvers essentially have the same arrangement, whereby the bullet has to jump the gap. The method(s) used in air guns to achieve the alignment do vary, but I think that provided an early airsporter is well maintained, there is no reason why accuracy should suffer.

I suppose the real question is what level of misalignment will significantly affect accuracy if all other factors such as trigger, shot to shot consistency, hold sensitivity, etc. etc., are removed?