Many will recall the article Mule Deer did back during the last dearth of .22 ammo. He cobbled together a bunch of RF-equivalent loads for CFs. Good stuff, but now good .22s are widely available for $.08-.09 a pop, less than the delivered price of primers. End of story.
There are some good uses for reduced loads in .22CFs, but under current conditions, not for fun or cheap practice. One of those adapters looks like the hot setup for an AR.
