I finally found a place to do some testing.
I've only tested the 2209 so far. I stopped at 45.5gr which was doing 2842fps from a 580mm barrel with suppressor. This matches up with the ADI max load and .260 Rem speeds. If anyone's interested here's the results (4 shots each charge):
Grains fps SD ES
42.5 2693 23.3 52
43.0 2726 12.6 28
43.5 2750 10.4 19 (only 3 shots)
44.0 2761 16.8 39
44.5 2780 9.9 24
45.0 2805 9.5 22
45.5 2842 21.8 43
~43.3gr and ~44.8gr will be worth looking at. I'm not sure if it's worthwhile testing lower loads. I didn't get any pressure signs but it seems like testing higher loads would be asking for trouble. Thanks everyone's suggestions.
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