Not exactly sure how to word this, but it seems to me it should be possible to come up with a list of target velocities for each barrel length and OBT nodes. Is there any published data?

(Now that i think of it, I guess it gets a lot more complicated because of the almost infinite choice of powders and bullets)

But I'd be interested to know what velocities I should target for this powder bullet combo:

Vanguard 223
24" barrel
1/12 twist
55gr sierra gameking
Winchester brass
IMR 8208 powder