A few thoughts to consider--
1 You want a clean kill at 400 metres. This means that allowing for mediocre shot placement, you will want about 1000 ft lbs at that range.
2 You will probably have allowed the client some practice shooting prior to hunting in order to familiarize them with the rifle. A high recoiling rifle will stuff most of them up. Therefore you need a heavy rifle to reduce recoil and muzzle jump. A long mid-weight barrel might be considered.
3 You will want to minimize the noise factor. Therefore you need a good can.
4 You require consistent accuracy and therefore a good quality rifle.
5 You require a very good indemnity clause and insurance policy. I would suggest this would exclude handloads.
In view of the above criteria, a powerful cartridge no less than 7mm / 284 / 308 cal 150 grain high bc round at >2800fps MV with a purpose installed recoil absorbing stock and a gross weight of not less than around 8 lbs is probably what you need; fitted with a can and cds dial scope. A portable rest would be mandatory.
Bolt action only.
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