We have had the same problem on our farm for about 15 years now, I have always used a 223. Short action for quick cycling, reasonably quiet when suppressed and unless you are taking shots over 200 yards or targeting a big old stinky boar with a thick shield, it will kill them fine. If you do come across a bigger one neck and head shots will still work. They are often in good sized groups so you want to be able to shoot, reload and acquire a new target quickly with whatever you choose. Any caliber of equal of greater killing power than even 222 will be fine if you are confident with it in my experience. Hope that's helpful, I certainly feel your friends pain, the little buggers can absolutely destroy good paddocks in no time!
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