Mixing of a small 700gr batch of “slow white” APCP pourable propellant for characterization tests. Actually this bimodal formula calls for ¼ part op 90µm AP but I have found this difficult to obtain. Hence the all 200µm AP. The AP I have contains 25% by weight of particles 0-150µm so I hope this comes close to the original formula calling for a 3:1 course to fine ratio. I might try some day to get some 90µm AP by ball milling the 200µm stuff.
The propellant was casting into two, 2 grain casting tubes each being placed onto a vibrating table while casting.