Re: 6.5x284 vs 6.5 creedmoor
I won't try to tell you what to buy, only suggest some things to consider.
The 6.5 Creedmoor was specifically designed to shoot heavy low drag bullets from a 2.85"
It's specs: case capacity 53.5 grains, max pressure 60191 psi, case length 1.920, overall length 2.80. (a difference of 0.89")
The 6.5x 284 is a necked down 284 win. It a proven 1000 yard benchrest match winner.
It's specs: case capacity 66 grains, max pressure:59465 psi, case length 2.170, overall length 3.228, (a difference 1.058")
Shooting the same bullets the 6.5 x 284 gives higher velocity, less drop, and less wind deflection, and somewhat less barrel life than the 6.5 Creedmoor.
HOWEVER, the 6.5 Creedmoor can be shot with reasonable length VLD bullets from a 2.85 inch magazine. The 6.5x 284 cannot.. It's really intended to be shot in a mid length action, like for a 30-06. I don't know what the magazine length of a Savage 110 Predator Max 1 is, but you should check whatever make and model rifle you choose that it can handle the bullets you might want to shoot.