Trail Boss is excellent for mellow plinking loads. I use it almost exclusively in my Cowboy Action loadings. My experience is that if you are loading a bottle neck cartridge, minimum is just fine. If loading a straight wall cartridge, the tendency is to not get a good powder burn (low pressure) until you get toward the middle range of what IMR lists on their web site (http://www.imrpowder.com/trailboss.html). That being said, I use 5.5 grains of Trail Boss in my 44 Special, 38-40 and 44-40 cartridges using a bullet in the 165-175 grain range.