Very good answer!!!
We use angled bases and scopes with 75-105 MOA adjustment to reach 1000 yards, 1 mile, or 1.5 miles with our 50BMG target rifles.
Angle bases do exactly like he says above - helps to keep scopes centered in adjustment- or allow for extreme range adjustment - 100 yards to 1760 yards with a 20 minute base.
OldmanFCSA = "Oldman" at Fifty Caliber Shooters Association www.fcsa.org
2012 & 2013 FCSA Regional Match Director - Alliance, NE - Spring Match June - Fall Match September 2013 - ALL 50BMG Shooters
FCSA Member & SCSA Member & NRA Member & AMA Member
"Oldage & Treachery will overcome Youth & Skill"