Resurrection of an oldish thread...
These variations between AR2209 and H4350 from version to version are somewhat frustrating, so I emailed Helmut the QL owner and he told me to always use the latest version of the Hodgdon powder, because those are the ones he tests. He does not test the ADI branded powder.
Looking at the history of variations between AR2209 and H4350, either there's quite a lot of variation between powder lots or Helmut's tests are not consistent, one or the other.
Anyway, I have accepted that I need to tune AR2209 as it models much lower velocities that I actually get for a given charge in my .243 and 6.5 Creedmoor.
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