hmm...well it won't take much powder at all to do what you want.
Quote:
Zak Smith's recipe:
Subsonic 223--
55gr flat base SP
3.0 - 4.0gr UNIQUE, depends on barrel and local environment
LC brass, WSR primer
Follow all prudent safety measures. These loads appear stable in 1:7.7 and 1:9 barrels.
I've found some references on the web through Google which refer to using faster powders for the 50-55gr bullets, such as Clays, N310, etc, but haven't tried any
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I would start at 3 grains of Unique for your 69 grain pills, and work up slowly.
Love to hear your results!
Jimro