I think you guys are really saying the same thing. MPBR or PBR is where the bullets path stays within the target parameters from bore to xx yards. Anythingoutside of thisrequires compensation on the shooters part.

Ie: My 150 BT load produces 3250 MV - running a ballistic program for my area here are some highlighted figures:

@ 32 yards near 0
@100 yards +2"
@ 150 Yards +2.4"(highest point above target centre)
@250 Yards 0
@300 Yards -2.8"

0 to 300 yards at no time does the bullet leave the 6" target zoneI have allocated, I consider this the loads MPBR for deer sized target. Beyond 300 yards I must make adjustments to remain within the target size in terms of elevation. This is strictly load cabability doesn't take in account wind drift, shooting ability, etc. Theory basedthat must be proven on the range to be consider accurate.