I usually use a 10 for show clipping on the body- I usually use a 40 for udder, 30 for legs and face, only because the blade is a better size for getting around the legs and face, and well, you want the udder clipped as close as possible. The biggest trick there is blending the lengths of hair from the 10 cut to the 30!
Oh and I tried using an Andis AGC Super 2 speed clipper(http://www.smartpakequine.com/ProductCl ... NA-_-18077
) before and I loved loved loved it!!! So quiet and smooth- that will be my next clipper purchase for sure!
and then Im throwing my Oster Turbo A5s in the trash