I’ve used 32gr bullets exclusively and shot hundreds of foxes, I don't get exit wounds at ranges <250y; if the bullet passes through the chest and out the other side, it’s not dumping all its energy in the animal and you’ll get runners. A 32gr .2 varmint round travelling at speed should explode in the chest cavity at anything over 2500 f/s, delivering a very clean kill. its well known deer run on with H/L shots as the soft nose bullets pass through the chest minimising meat damage. Varmint bullets do exactly the opposite bang - flop as 1000flb of energy is dumped into the fox.
204, 222, 223, 22-250, 243, 6mm etc all do this very efficiently with the correct bullet choice. My only experience with runners (more than 10ft from where it’s shot) is as a result of poor bullet placement (wind, loss of zero, me too excited, etc).
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