Mid South gets them made by hornady.. they are actually seconds from Hornady...
In the .224's, the 55gr w/cannelure has a Hornady "spire point" profile, but the Varmint Extreme 50 and 55gr SP are more of a "secant" ogive, which is not a Hornady offering. Plus they now have a .20 / 32gr HP and .17 / 20gr HP, neither a Hornady offering.
So not sure who makes those, but not likely Hornady.
My AR in 223 likes the 50gr on top of AA2200, but a normally reliable NEF in 223 wasn't happy. I had hoped for a "universal" load for my 223's using 2200, but was not so lucky.
Greg