Hornady 50 gr SP out of the deuce blows their minds, but not much else.. Just make sure of your shot placement, and you should be fine...

If I recall correctly, this one entered right in the ear on the other side, and was angling towards me...What you see was the extent of the damage. Plenty o' backstraps left there, especially if you make your shot placement better than that..

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Those Alberts skwerrels are neat looking little critters..