I've owned a .220 Swift. I still own multiple .223s and a .243. ...Plus many other larger calibers.
For me, my favorite "tinsel maker" is still the .22 WMR Marlin with Winchester Supreme HPs. (I usually buy the 34 (36?) gr version, but the 30 gr load is just as destructive.)
A close second would probably be Speer 100 gr "Bucket Mouth" HPs in .270 Winchester, at 3,400 fps. That load does beautiful things with potatoes, soda cans, squirrels, rabbits, prairie dogs, mud, and pretty much anything else that can splatter, explode, or paint pretty pictures.
It blows even most of my .220 Swift .243 Win loads out of the water, as far as destruction and "red mist"-factor.
What's the deal with 22 magnum not being available?
People got tired of seeing .22 WMR on store shelves, but no .22 LR.
So, they bought .22 'magnum' rifles or dug the old .22 WMR cylinder out of storage for their Single-Six, and started tearing into the .22 WMR ammo.
.22 WRF was the next to get attention.
(I buy my preferred.22 WMR load by the 'brick' (500 rounds) when it's priced right, so it hasn't really impacted my shooting. A box of the Win Supreme HPs lasts me about 5 years, since that's a 'specialty' load in my rifle.)