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TBR PERFORMANCE GROUP SELECTION TABLE: FOR BEST FIT UP TO 800 YARDS
TBR
Group
800 Yards Bullet Path
Sight-in
Range
A
Less than -96 inches of path height 300 Yards
B
-96 to -120 inches 300 Yards
C
-139 to -164 inches** 200 Yards
AB
-164 to -189 inches 200 Yards
AC
-189 to -212 inches 200 Yards
BC
-212 to -236 inches 200 Yards
ABC
More than -236 inches of path height (if the path height is more than 250 inches, performance
will be reduced by the difference)
200 Yards
** If your bullet path height is less than -139 inches at 800 yards with a 200 yard sight-in, consider sighting-in at
300 yards and selecting group A or B. Alternately, you can use group C with a 200 yard sight-in, but the TBR will
be less accurate at extreme long ranges.
REMEMBER:
Knowing your theoretical bullet path at long ranges is not a
license to take shots beyond ranges at which you have practiced, particularly
at game animals or where stray shots could hit unintended targets. It is your
responsibility to have an intimate familiarity with the performance of your
firearm and to know where the bullet is going to go. The RX rangefinder may
serve best as a tool for learning performance during practice at a secure range
so you are ready for that critical shot.
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