A change in the law to allow .22 centrefires to be used will not lead to more wounded animals or a drastic increase in the number of stalkers. You have still got to have deer in your area to shoot them, that will rule out half the number of .22 centrefire shooters who ae more interested in shooting fox anyway. As for animal wellfare allowing these calibres to be used for roe and muntjac is merely bringing us into line with the rest of Europe. If anything small calibres will lead to better and cleaner kills of these smaller types of deer. A large high velocity bullet does not expand as well in a smaller target as a smaller round fired at the same target. This is down to energy down range. While smaller bullets are faster flying and have a flatter trajectory in general they carry less energy into the target therefore slow down quicker and will expand better in a smaller target. Larger calibre bullets such as .270, .308 have a greater down range energy and require a large target to expand to best effect. A happy medium is .243 however in the case of these species of deer smaller calibres will probably do as gooder job if not a better one. One of the great hunter W.D.M Bell used to .220 swift on large Red Deer stags with great effect. For him it had an almost uncanny ability to kill big red deer stags as if they had been electrocuted. P.O. Ackley preffered .220 swift to 30.06 for shooting deer he felt that the smaller round did a much better job of knocking them down. If you wish to read the article I will post the thread to it. Jason it is possible to over kill something, this would lead to bad press more so than the use of a smaller calibre wounding a deer. A 200 grain bullet from a 30.06 would make a very large exit wound in a deer or for that matter .300 wsm this would frankly be over kill. Their would be a very large amount of meat damage. Meat damage or damage to the carcass is how you determine whether a calibre is over kill on a particular species of deer. Aside from all this the average male human being weighs around 85 kilos a little more than the average muntjac or roe deer, yet all the modern armies have gone to 5.56mm which is the military version of .223 for knocking us off and their not allowed to use expanding ammunition, there must be something to it.