The real issue here is the pressure and being compliant with the standard. Billy

yes, Billy had his tested by Precision, so I was wondering how they (Alliant) recommended 13gr--the same as in the HS hull . The HS is a straight walled hall and the CF a tapered hall. I am going to load a little more conservatively and see how they shoot.

This is interesting. I have about worn out all my old CF hulls and am down to nothing but the HS ones. I haven't gotten around to chronographing the load in either hull but I will have to do that.
C.G.B.