Bacon grease for bait on bucket trap roller, raisin packed into bait trigger on spring trap- it gets dry, and they tug at it-
standard Colibri loads in .22 pistol out in the shop. The new spring traps that you just pinch to set or release are working well here in CO and at our MO place. But I've got another dang pack-rat out in the shop, and that bugger is smart.
