You would need at least a 308 or 30-06 to have enough velocity to get them to mushroom up.
I would like to try the Barnes blackout 110gr, the Americans rave about them but very expensive for knocking goats over. For me the Nosler 125gr BT has been a good all round performer on deer, pigs and goats. I don't really want to start running two lots of supersonic ammo as I am already got three lots of subsonic rounds.
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