I sincerely hope that you have better luck getting the 60 grain Partition to shoot than I have had. It has been one of two Partitions bullets that I have had to work hard with to find an accurate load, the other being the 125 grain .264" Partition.
The 64 grain Winchester/Olin Power Point is shorter and not as aerodynamic, but for me it has been an easy bullet to find an accurate load for in the 222, 223, 223 WSSM, and 22-250.
Try some IMR-4895 behind them, lit with CCI-400's.
They don't seem to like ball powders.