RE: why use 150 grains of powder?
150 grains is just a maximum, but too many people think that they MUST shoot that much to be effective, but usually sacrifice accuracy to squeeze another 100fps out of their ML. I work up my loads like one would for handloads in a CF rifle. I start at a reasonably low charge and work up in 5 grain increments until I find the fastest load without opening up the groups. I've found that 100-110 grains is about optimum with my DISC.
You don't hurt 'em if you don't hit 'em!
Mike
Gun control means putting the second bullet through the same hole as the first- Ted Nugent
NRA Member
"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -Ben Franklin