Charles Askins, the famous (or notorious) gunwriter was a very capable Bullseye pistol competitor. If you are not familiar with the “2700” match format, it has three 900 point matches each intended to be shot with a different gun: .22 LR, any Centerfire, and .45. Back in the 1930s, Askins decided that a great centerfire gun would be a Colt Woodsman converted to fire a centerfire cartridge. He used the .22 Velodog as the parent case, and called the resulting cartridge the .221 Askins. Pachmayr Gun Works did the conversion. (see attached)
Anyhow, his idea worked brilliantly! The Woodsman was already established as the best American-made autoloading target pistol.
His conversion idea gave him a huge edge over the .38 revolvers that just about everyone else was using, especially in the timed and rapid fire stages. He won quite a few matches with that gun!
Well, a lot of fellow shooters considered Askins’ .22 CF conversion to be an unfair advantage. Eventually, NRA rules were changed to stipulate a minimum .32 caliber for the Centerfire match.
The next stage in the “centerfire conversion” game that I am familiar with is the .32 Wadcutter modified Ruger MKI auto devised by Atkinson & Marquart, the famous gunsmith team once based in Arizona.
I wrote a post about that:
https://smith-wessonforum.com/141569453-post13.html