For me it was a couple. 40-odd years ago after reading and re-reading Landis' ".22 Caliber Varmint Rifles" I had an urge to to acquire an R2 Lovell and/or a .219 Donaldson Wasp. I did both, in a pair of custom Winchester High Walls. I stuck with the R2 Lovell chambering in a succession of rifles (currently two- another High Wall and an '03 Springfield single shot), but the Wasp was a once-and-done proposition although I wouldn't mind another one.