Tried some 4064 in and OCW test and the promising results were at speeds we're not supposed to see with a 22-inch barrel.
FA 63 Match cases, reloaded 1x before
WLR primers
Seated 2.82 or so OAL
New ordinary match barrel from Springfield Armory
Temp 80 F, humidity probably 30-40.
45.0 (last of...