In any case a 7mm with a decent bullet will kill a fallow very well with half decent shooting. A shot to the brain or the skull very near the brain will shatter the skull. I've had a deer's head explode in spectacular fashion, bits landing a good 20 metres in a bit circle with my .30-06 and 150 gr Nosler solid bases. Same any reasonably well placed shot into the lungs or heart region will drop a fallow well with similar rifles. A heart shot beast might run 50 metres or more but will still be dead.

IMO a brain shot - if not worried about antlers - or a good lung or double lung shot, are good shots for maximum meat recovery.

For wild fallow I usually use my .30-06 or .308. I have used a .22 Mag and .222 for wild fallow as well. For my farmed fallow I have always used a .22 Mag. Might start using the .222 as more margin for error. The simple fact is if using a .22 there is no real margin for error. I've probably shot a hundred deer (?) with the .22 Mag in the head. Maybe eight needed a second shot. A .22 in the top of the heart also will kill well I've been told, strictly broadside on the right dot on the chest. A mates advice once, I won't go into details of why and how he makes these shots. Not poaching, more about it being 'quite' an urban area. Ask me in person one day.

Kiwis have claimed the .22 Hornet/,222/.223 sized calibres are good wild deer shooters too. For does and yearlings, often quite adequate.

However I do recommend a decent centrefire starting with .243 myself for wild fallow.

Found some good butchering videos on youtube. I'll put them up on a new thread for anyone interested. I learned what I should be doing ....