You're very close to max with that bullet+powder.
ADI 8208 = IMR8208XBR
Increasing seating depth can cause dangerous pressure increases with certain powder/bullet/temp combinations. Always use the stated seating depth for a load or, if not stated, 2.260in (57.5mm).
There's a Grendel specific site which can tell you more than you'll ever need to know about the 6.5 Grendel.
Good bunch of guys for the most part.
It has user load data if you're serious about reloading for the Grendel.
Welcome to the 6.5 Grendel Forum : : The World's Tier One AR Cartridge
Check out the reloading forum and begin with BFT's Lengthy List of Loads.
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