Re: 6.5x284 bullet for deer?
I've had great success with the 140 gr Hornady SST and Amax also the 130 gr Scirocco and Accubond.
The AB and Scirocco seem to be tougher than either of the the Hornadys and are probably better suited for inside 300 yd shot. However the Scirocco can be a little finicky to get to shoot but the .571 BC and expansion down to 1700 fps makes it attractive as an all around bullet.
The SST and Amax are better suited to longer ranges or pefect broadside shots. They seem to expand more readily especially at longer ranges.
All of this is just MHO but from my experiance all of these will drop deer right where they stand.
Ignorance can be treated with education, sadly there is no cure for stupidity.