The BBT "P-Max" internal ballistics simulator

POWDER SELECTION
Manufacturer
Powder type
Chemie Swiss
Vihtavuori
REQUIRED DATA
Usable case capacity:
 cc  grains of water
Powder weight:
 grams  grains
Bullet weight:
 grams  grains
Bullet type:
 Copper jacketed, lead core ( moly'd)
 Lead
 Bore rider with drive band
   
Calibre:
   
Barrel length:
 millimetres  inches
Case length:
 millimetres  inches
Pressure output:
 psi (piezo).  bar  
Velocity output:
 metres/sec.  feet/sec.  
Muzzle energy output:
 Joules.  ft-lbs.  

 
WARNING
This program does not take the place of a reloading manual published by the relevant powder company for estimating starting loads or maximum loads.

What this program does
This is a free, online, internal ballistics simulation program. There is no other online program like it. There are no issues with operating systems - so long as your device has a browser and can access the Internet, you can use this simulator. There are no problems with getting the latest update. As soon as the simulator or its data libraries are updated, those updates are available next time you use this simulator.

Given the various inputs listed above, the program uses closed bomb data for the powder to simulate the evolution of the gas pressure and the velocity of the bullet as it travels up the barrel. This program is a numerical simulation. It makes no prior assumptions about pressure rise or any other variable. It just runs the basic physics of what happens next as the virtual charge of powder burns. A summary of the results are given. Graphs are plotted for pressure -vs- time, pressure -vs- distance along the barrel, and bullet velocity -vs- distance along the barrel.

Using the program
The purpose of this simulator is to help you select the right powder for your particular cartridge/calibre/bullet combination and to give you a reasonable idea of the performance you might expect. However, the place to do load development is on a range with your particular firearm, not on a keyboard in front of a computer.

This simulator is not intended to replace the relevant reloading manual as a guide to good starting loads or safe maximum loads. You should follow safe reloading practices at all times.

While this simulator is designed to be intuitive and easy to use, it is strongly suggested that you read the manual for this simulator. It will help you get sensible and realistic results.

Usable case capacity to be entered is the capacity behind the loaded bullet, NOT the case capacity to the case mouth. See a list of case capacities to get you started and read more about case capacities in the manual (see link above).

Version 1.1