The smallest balling gun that I've got or have been able to find are too big for the smaller sized pills. When you rastle the calf to get it in about half the time the pill falls out and you have to start over. I put the pill in then put a gob of peanut butter over the end, holds the pill in and the stuff is eatable. I guess if you have a calf with a peanut allergy it could cause a problem though