An Energy/Leathality Calculator for
The program was written out of frustration. I am a handloader, and sometimes
experiment with different loads, in different firearms. I possess a chronograph,
and am able, thus, to measure the speed of my loads. The calculations are
straighforward enough, but are very tedious. In particular one of the constants
is very large, and it is easy, when calculating for many different loads,
to make a mistake.
Using the calculator
The program was written in Visual Basic.Net. If you have
not already got the .Net framework on your computer, you will need to install
it from the Microsoft
Download site. Be forwarned that it is about 20mb in size.I have included
some details in a section below.
This calculator is capable of figuring bullet energy, using
weight and velocity, and bullet lethality by applying compensation factors,
based upon bullet styles. In order to use the program, you must first enter
the bullet weight, bullet velocity, and bullet diameter. Once these variables
are entered in the appropriate spaces, click on the "Click Here to Calculate"
button. This will calculate bullet energy, and will calculate lethality for
a standard round nose lead bullet.
Once the energy calculations have finished, you may chose
a different bullet style by clicking on one of the "Bullet Type Factors" buttons
on the bottom of the window. This will not affect the energy calculations,
which would be the same for any bullet style, but will change the lethality
ratings. The program is also set to recognize the speed of effectiveness of
certain bullet types. For example, if you are calculating a 230 grain bullet
traveling at 750 fps, and use the hollow point bullet type factor, you will
notice no change, because hollow points do not reliably expand at that speed.
This calculator will calculate lethality according to
the Hatcher, Taylor, and Hatcher short scales, as well as a little system
that I came up with myself, based upon diameter, and energy per square inch.
There are only two bugs, of which I am aware, in this
program. The first is that it will not calculate very large energies. This
will not be a problem for most shooters; but if you are calculating the energy
of your 50BMG, you may get an error message as the program will run out of
calculating space. The other bug is in the way that the bullet type factors
are figured out. The bullet factors multiply the energy, and sometimes the
diameter, by a known constant related to a specific bullet type. If you click
on more than one bullet type factor, both factors will be applied. If you
have one load, and wish to calculate it's lethality with several different
bullet types, you will need to do each calculation individually.
About the .Net Framework
This program was written in Microsoft
Visual Basic .net, and will require the .net framework in order to run. Your
computer may already have .Net installed. If the .net framework is not installed,
you will get one of the error messages shown below.:
|The solution to either of
these mesasges is to install the Microsoft .Net framework. This can be downloaded
for free, as a 19.7 mb file, from
Microsft's website.You will need to unzip this file to a known location,
and then run it to update your system.