One thing to note is for reasons unknown, many manuals list max pressure loads below 50k CUP. SAAMI specs I guess, but not sure why since the 222 was introduced by Remington in a strong bolt gun.
Could be a reason the 221 Fireball often has loads surpassing the 222, at least in the lighter bullets.
Speed isn't the do-all, but it's nice to know if accuracy looks promising at "book" max loads, you can likely go beyond those safely.

Greg


NRA/TSRA Life