I would start somewhere around 50-51gr and build up from there. That should have you starting on the safe side. I got up to 55gr where I hit pressure with 2209 and the 150NBT in mine. Pressure at 54gr with Rel 17 and 162 ELD-M. Pressure at 53gr with Rel 17 and the 162 ELD-X. Hopefully that helps somewhat.
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