Saturday, August 11, 2012

Riflecraft and Simulated Distance Targets

I'm trying not to break the chain on my rifle practice, so I've been spending 15 minutes a night dry firing at a simulated distance target. Because the 500 yard target was the one I had the most problems with, I only made that target, but will probably make some 300 and 175 targets just to cool down. At 500 yards, the "bell" is a little larger than a dot, and focusing on it fatigues my eyes after 10 minutes.

Making simulated distance targets isn't too hard when you think of it as a ratio.

If you want to shoot a 12 inch target at 400 yards, but you only have 4 yards in which to practice, you want to solve for the size of the target at 4 yards.

As a ratio, this looks like this (all measurements in yards)
Target size        Simulated size 
--------------- =  --------------
Target distance    Available distance

.333     X
---- = ---
 400     4
Which we solve by criss crossing the equation;
400 * X = .333 * 4
400X = 1.332
Get the X by itself by dividing both sides by 400...
400X / 400 = 1.332 / 400
X = 0.00333
So a 0.333 yard target at 400 yards would be 0.00333 yards (0.11988 inches) at 4 yards. The numbers here are round enough to check ourselves to prove the method works. A 0.333 yard target at one hundredth the distance is one hundredth the size.

Grab your calipers and see if you can achieve a clean break with good follow through to confirm hits on your simulated targets. Obviously, this training doesn't account for bullet drop or wind, but we're focusing on your fundamentals.


Cerys said...

This is cool!

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