I have loaded my own, back in the day, using the yellow Speer plastic capsules.
However since CCI/Speer had been offering them as a factory item I have been just using them.
I have used them in 9mm, 38 Special, 44 Mag and 45 ACP.
And I have used a few hundred of them.
The 45ACP and 44 Mag are the most effective, the wife and I have killed dozens of snakes, rabbits, squirrels, quail doves, grouse,[I like to eat small game] and I have even killed a porcipine [sp] with a 9mm. With the 44 I have killed ptarmargin in Alaska, and a few snakes in Africa.
Just in the last 2 weeks, here on our place the wife has killed 2 snakes with her 38 S&W Centennial, and I killed 2 with my 1911. All were Diamondback watersnakes over 40" long.
I find the CCI/Speer factory shotshells very effective. I never go into the field without a bunch of them.
With the 44 or 45 I have never had to shoot a snake more than twice, and I have killed some pretty BIG rattlers, as well as Cotton Mouth, and Copperheads.