It doesn't require a good shot if shot point blank. I would take a chicken and calmly place their head on a 1/2" piece of lumber on the ground. I would gently stroke their neck or head until they relaxed a little (some would relax better than others). Then I took the cocked and loaded pellet...
Totally agree on not using 22 ammo--we still can't hardly find any
My honey has used a pellet gun to take down roosters, but you've got to be a very good shot. Their heads are so tiny and in constant motion. Knife or hatchet is probably best for newbies.
Have you tried advertising them as black meat birds? There are ethnic groups that love silkie meat, not sure if that's the case in your area.
In terms of pounds of meat per hours invested, you're going to come out in the negative this time for sure. But, it's experience for next time. When...