Greetings,
Early on a lot of people went to AR2208 and IMR4064 in the 7mm-08 due to the difficulty of getting top loads of 48 to 50 grains of AR2209 in the case. The Hodgdon data for the 139 grain Hornady Interlock is some of the old data. From my notes 42.5 grains of AR2208 (a grain under max) gave 2,710 fps from a 19 inch barrel. 43.5 grains should produce 2,750 fps or a little more. Data for AR2209 is more of a problem due to the change in speed around 2002. The current stuff in the plastic containers will likely take around 1.5 grains less of powder for the same speed based on my test firing in my 6.5. Adding a bit back for the Hodgdons load being below book pressure leads me to a book max load of around 49 grains of new AR2209 for around 2,800 fps in your 19 inch barrel. You will have the data to compare with this. This data is for the 139 grain Hornady interlock only.
Regards Grandpamac.
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