Longhair,
Am using #160 conibears.
I have a variety of namebrands: Northwoods, Dukes, BMI's and such.
These are killer traps, set in each hole for large scale field work. No bait.
If I have a home owner that has a problem Groundhog in his garden or under his shed and I am not able to use a killer trap because of kids and pets, I will use a baited cage trap (live trap). I use Fox Ridge Mulberry paste bait in cage traps.