My two cents:
T3's tend to like anything you feed them, powder and projectiles - 2209 (in Swede) is good but IMR7828 and Re22 will get you similar velocity with less pressure, ADI2213 or H4831 will be real accurate, but less velocity than the others. The only bullet weight you might find makes the 6.5 fussy is the 100gn, if you go that route try ADI2208, load data actual, is a bit dodgy to give as every rifle is different.
The BC's are shit, but for a 300yd load the 130gn Sierra HP Gameking is a real buster, and for a 150yd bush load try the Hornady 160gn round nose will be super accurate. Further out the 130VLD and 140 VLD are hard to beat. The 140 VLD kills big animals dead as, as far out as you can sensibly shoot.
Bookmarks