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And here are the MAXIMUM LOADS for a variety of powders - if you use this data work up and cross check it against other sources

artridge : 6.5-06 A-Square
Bullet : .264, 143,...

Here's AR2209

Cartridge : 6.5-06 A-Square
Bullet : .264, 143, Hornady ELD-X 2635 G7
Useable Case Capaci: 62.618 grain H2O = 4.066 cm³
Cartridge O.A.L. L6: 3.424 inch =...

Let me know how long your barrel is, over-all cartridge length and I'll run some more Q/L data for you . . . If you want it really accurate give me the case capacity in H20

Here's what Quickload says - interpret with care:

Cartridge : 6.5-06 A-Square
Bullet : .264, 143, Hornady ELD-X 2635 G7
Useable Case Capaci: 60.353 grain H2O = 3.919 cm³...