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For Ackley cartridges, you can use the load data from the original as your start point. FYI "ADI Benchmark 2" = "Hodgdon Benchmark".
You can head to the Hodgdon/ADI websites and look what they say about using BM/BM2 in a 22-250... 33.5gr to 36gr for a 50gr Sierra SP... The VMax will be similar. You've got more case capacity over a straight 22-250 so I'd start around 35gr and go up.
Thank you I will start with that and work my way up.
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