All around, good metering powder?

[Stumpnav]

TAC. Meters like water. I've run it with everything from 52 to 80 gr and it does great with all of them. RL15 is another good choice.

[eightmillimeter]

If metering is your priority then go ball. If your emphasis is 69-77 grain pills then go AA2230, AA2460, AA2520, or TAC with an emphasis on 2520 and TAC. CFE223 is nice but too slow for the 40's, you'll waste a lot of powder getting them moving.

[mic2377]

FYI do not dismiss fine grain extruded powders from your choices. 8208 XBR is a prime example of this. I have also used other short-cut extruded powders (Accurate 4064 and 2495) with very good metering success in an RCBS Uniflow. Ball powders remain very hard to find now and I have had excellent results from these other powders.