I weigh all of my loads as I have not figured out what in sams hill is the standard for a "volumetric" measurement. After a few phone calls and reading everything I could find on this powder, I choose to use .668gr weight to equal 1gr vol.meas? I start with 66.8gr(wt)= 100gr(vol?) . Out of our TC Omega and TC Encore we are using by weight 68.5gr BH209 using 250gr Barnes TMZ boat tails w/Win 209 primers. I tried up to 73gr(wt),ouch,it hammered me and was too much for the 250gr sabot.