Killer,

I think the part your having a hard time understanding is that MPBR has nothing to do with the ability of the shooter. It refers only to the cartridge when sighted in to hit a specific size target. When that happens it is the ability of the cartridge and the cartridge alone that is measured, not the user if he decide's to raise the sight's.

Concider for a moment the 14" target at 700 yds. With a 14" target, NO cartridge will keep a bullet within 7" of line of sight to 700 yds. Therefor the MPBR is quite a bit less and the trajectory mush be compensated for by raising the sight's. On my 6.5x06, the bullet I use falls99.2" inches below "zero" at 700 yds. Zero is less than MPBR but the only thing that matter's when you start raising the sight's is how far below the line of sight you are.

Here's the data on the load I'm using:

BC. .525
vel. 2900 fps
MPBR 286 yds
MPB zero 245 yds
deflection @ 100 yds +2.6"

Using this data if I expect to hit an 6" target at 350 yds I'll have to raise the sight or go under it. Then by raising the sight I'll shoot over that same target at mid range. It is because I have exceded the MPBR for that size of target and the velocity I'm shooting the bullet. Again, the MPBR is a measure of the ability of the "cartridge" when a bullet is fired at a "certain velocity" at a target of a "certain size".

My scanner is not working or I would be happy to e-mail you the defination from Sierra. Hope this help's.

Sorrry I hit the wrong key. My 6.5x06 is sighted in for a MPBR at a 6" target, not 8".