What leads you to believe that this load is running 50fps slower than expected please? I would be more inclined to the view that you are seeing 100fps more than expected, which inevitably means you must be generating higher peak pressures than expected from some variation in the powder, case capacity etc. The ballistic calculators will tell you that closer to 75kPSI peak will result for a 2600fps MV from only a 17" barrel for 2208. It would be remiss of me to read your posts and to then not advise caution.
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