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Here's some information that might help in understanding some of the inconsistencies in BH.Has anyone done the experiment that would prove this one way or the other?
Pretty simple really:
Get 3 lots of BH 209 that differ noticeably in volume to weight per lot.
Fire 3 shots from each bottle at 100 grV and compare the velocities. If they are essentially the same, you can stop there. Volume rules.
If the velocities are different, then you take 70 gr by weight of each powder and shoot 3 times with each. If weight rules, these velocities should be essentially equal.
I will be on the volume rules side of this until that is proven wrong.
Sorry no data specific to volume only, but the first chart shows you average weight by volume.
Here's another issue that has to be taken into account, velocity differences with the EXACT amount of propellant, but with different loading forces.........
If you've been following any of GaSmokey's posts, you'll recognize more about loading forces and how it can affect velocities/groups.
NOTICE............. how with identical weight bullets and identical weight charges, the difference in velocities between the two different bullets themselves.
This information and much of the BS in this thread really doesn't matter much to the hunter shooting out to 100yds and only looking for "minute of deer". Load by volume or by weight and won't matter much. You should easily get "minute of deer".
However............ if anyone is determined to get every possible advantage available for accuracy, especially beyond "minute of deer", then this information can be useful.