We tend to be over regulated here in England but the Deer Act specifies a calibre not less than .240 and a muzzle energy of not less than 1700 ft. lbs. We can now use certain .22 centrefires with a minimum 50 grain bullet for the little Muntjac and Chinese Water Deer. Scotland has a slightly different formula but much in the same vein. In Britain deer stalking lies in the art of getting as close as possible to the deer and dropping it with one well placed shot. So far my longest shot at a Roe deer was 125 yards and I have never shot a Red or Sika over 100 yards. The last Sika was nearer 20 yards. Anyone useing a .22 rf. should be shot with one himself. Lagopus.....