A 160 works perfectly. If you place it in a sqaure bucket, cut notches in the end of the bucket for the springs right in the middle, the traps stays above center in the bucket. Place a small rock or stick below the trap to discourage them from trying to reach the bait with their paw.
Another note is to keep your trigger off to one side as much as possible.
Good luck.
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Aim small...
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