Thread: Long Range Shooting and TBR

Originally Posted by Tui4Me

Yeah I think TBR is great for anyone wanting to shoot out to 400m

Beyond that IMO it's faster and more accurate to..

1. Take a 'line of sight' range and an angle (if your range finder displays angles)
2. Refer to your drop chart that has columns for 10° 15° 20° bullet drops (customise this to the angles you typically encounter)

IF you use a BCD or CDS turret, you won't need to refer to a drop chart but you will need to have an idea of how many clicks you need to subtract based on ranges and angles.

How can it be faster to input 1 distance (TBR) than a distance and angle? Makes no sense, or are you implying after 400m TBR rangefinders are inaccurate?

Originally Posted by Gibo

How can it be faster to input 1 distance (TBR) than a distance and angle? Makes no sense, or are you implying after 400m TBR rangefinders are inaccurate?

IMO - Based on the drops I have calculated comparing them, and the article Chalkeye posted about TBR, I wouldn't recommend shooting at a deer using TBR past 400m.

TBR is great for someone with a ballistic reticle that wants to shoot out to 400m but beyond that it has limitations.

@Tui4Me, I suspect you simply forgot to remove the angle value when you entered the TBR. Remember that when you use a TBR value, the angle needs to be reset to 0

TBR is just simple trigonometry. You effectively have the hypotenuse, and want to calculate the length of the adjacent side. The formula is:

adjacent = cos(angle) x hypotenuse

There is a small difference between entering just the TBR into a ballistic solver, compared to entering the line-of-sight range and the angle. But it should not be more than 1 or 2 clicks, assuming your turrets are 1/4 MOA or 1/10 MRAD.

Originally Posted by ebf

@Tui4Me, I suspect you simply forgot to remove the angle value when you entered the TBR. Remember that when you use a TBR value, the angle needs to be reset to 0

TBR is just simple trigonometry. You effectively have the hypotenuse, and want to calculate the length of the adjacent side. The formula is:

adjacent = cos(angle) x hypotenuse

There is a small difference between entering just the TBR into a ballistic solver, compared to entering the line-of-sight range and the angle. But it should not be more than 1 or 2 clicks, assuming your turrets are 1/4 MOA or 1/10 MRAD.

Using shooter I calculated the following:

650y (line of site) @ 15° angle = 70.4" of drop

628y (TBR) @ 0° angle = 67.2" of drop

Error in mm's = 81.28