My barrel is 24" I am using 2209 now but have some other powders including N550.
It is an Ackley and I get 2950 with heavier bullets and great case life. So I would think no where near max with a 123, although with 2209 it indicates I am at near max @2950.
I am sure velocities are accurate as I have a V3 magnetospeed.
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