Jason,
Fit has to do with how well you pick your stock to begin with and then how adjustable or adaptable it is when you need to get into different positions. Take a prone shot. No problem. Now, take a prone shot where you're shooting down hill or even worse, up hill. Take the following pic. Hard to see but I'm lying down hill and my shot is up hill. Why didn't I sit or kneel, because it was about a 900 yd shot. Not steady enough except from prone. Looks like I'm using my Harris bipod but even extended all the way it wouldn't' bring my muzzle up enough so I had to use my PRS system SLIK tripod and mount to hold the rifle up high enough yet still allow the butt to stay close to the ground for the rear support.
And yes, that is my 1.5 AICS chassis shooting my 6.5x47. This was last June as the Challenge at Altitude shoot up Weber Canyon, Utah. We're at about 8,000'.
Alan