My CVA manuals for my Magbolt states 100gr max of loose powder with the recomended powders being Pyrodex or black. 150gr of pellets is also the max. When usinga maxload you are further restricted to a max of 400gr conicals/300gr sabot bullets.

In several communications with CVA over the years, when asked about 777 loose powder, they have consistently told me that 100gr was the max for loose. 777's slower burn rate seems to be the reason why it produces more velocity with similar pressure as other powders.

Also in my communications with CVA, the max bullet weight allowed is higher when limiting powder charges to 100gr. This includes bullets up to and including the heaviest PowerBelt (I believe that is 530gr for the 50).

If anyone is interested in using any of the loads implied in this post, please verify them with CVA before doing so. I did for my own sake and safety, you should do the same for yourself.

The difference between the pellet max and loose max could be, in part, due to several things. First, there is only so much powder you can burn in a given length of barrel efficiently, any more and your just pushing the extra wieght out the barrel. In the case of pellets, the volume of space required in the barrel for them is greater than the volume of space required for loose. This gives a larger surface area within the combustion chamber behind the bullet and therefore reduces the PSI generated whencomparing powder and pellet charges that are equal. This would require larger pellet loads to equal the pressure generated by the loose power. But thats just my theory.