We were taught to aim for the groin using the 37mm 'batton' guns during riots. One good hit (by a 1lb hard rubber 'bullet' at 600fps) usually got a scream that the whole city could hear and it is very hard to throw bricks and molotove cocktails while using both hands to protect the groin....
Also a fiar point on the veriety of guns...I own six 9,3 rifles- have one in the three countries I normally hunt, one at the farm, and a couple at home. There is always 9,3 ammo in my truck and pack. The same goes for .44 mag (since I always carry one). There is little point in having a specialised weapon and ammo system in bulk tied to one point- if it is all at home and you cannot get home... it is useless. and having one caliber for in town and one for in the country...( I appreciate Americans don't need to deal with elephants and lions so something alot smaller than my 9,3 is appropriate). Still, it is hard to beat the old triad of a decent, long range rifle, a good shotgun and a reliable handgun.