I had some 8208 XBR powder kicking around, so I tried it in my 222. Shot really accurate. So much so that I worked up a load in my 222 mag also. Worked great in that also. Worth a try if you have some.
Good luck. Great cartridge!
Got the data from the new Sierra manual
QM

Last edited by Quartermaster; 01/26/23.
NRA Life Member

"You might as well be wrong, as be right and not know it"