Plainsman 175 Question

I recently was given a nice Plainsman 175, and it works perfectly. Even made an extended CO2 cap so I can shoot 12 gram'ers out of it. I only get 5, 6 or maybe 7 shots, semi-auto , till I have to shake it and refill the internal BB magazine. Looked online and can find nothing about this. My question is, What is the correct way to shake it so I can max out my shot count?

thanks for any help here.



(Septic, I enjoy your videos about this pistol)