Brief, when you get into reloading--by the looks it won't be long-- 300blkout subs make a nice testing round.
I've been casting and powdercoating my own projectiles for a while.. for pistol and 300 subs, it's the cats meow.. self reliance was the goal..
getting into reloading right now though could be frustrating with components availability .. pretty sad out there with primers..

I enjoy a .22 as well.. both pistol and ar rifle.. fun stuff.