For culling I personally wouldn't recommend a rimfire. The idea is to kill as many as quickly as possible, shot placement is critical with a rimfire, a lot more margin of error with a centerfire.
I use a howa mini action .223 with a couple of mags and also a shotgun with buckshot. If you can sneak right up a semi with buckshot in hand just annihilates them. Empty the mag then pick up the .223.
Or on flat paddocks cut them off with a quad bike then let rip with buckshot. Two shooters both with a shotgun and a centerfire and depending where the mob is more often than not there are very few survivors.
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