.223 Remington with 60 grain projectiles.
This has been a "standard load" of mine since the early-1980s. Three different powders (IMR 4198, IMR 3031 and
Win 748) with the same point of impact at 100 yards. During the shortage of powder at the retail level during the late 20-teend, I reformulated the load using IMR 4064.
While I prefer IMR 3031, I have been able to get IMR 4064 to work with both 55 and 60 grain loads. Still IMR 4064 seems to be very "finnicky" in that it seems more sensitive to changes in components rather than just bullet weight and powder charge.