Results and output fields

The result and output fields contain multiple information (starting top left to bottom right):

• Summaries / description of substantial simulation data (caliber, powder type, powder mass, OAL and seating depth, specific and representative [max] values of the simulation
• A characteristic diagram to display the “vivaciousness” of the powder in its three simulation phases
• A combined diagram including the calculated values of pressure, energy and projectile velocity (selection fields for the load development ladder)

The result and output field has a tab bar at the top. By clicking on the “+” symbol, notes, images and files can be added to the current load file (*.grtload). The added data is stored in the load file.

First, the caliber is being picked from the caliber database. This choice is independent from the CIP maximal values assigned to the relevant caliber which may have been changed (e.g. pressure)

• projectile
  The next label determines the projectile picked from the projectile database including the description stored in the database (manufacturer, product name, bullet weight in grain).
• propellant charge
  This label describes the powder picked from the powder database including the relevant description stored in the database (manufacturer, product name). These data sets are completed by maximal powder mass provided in the powder load window (in grain).
• load development ladder
  Contains no further information but an indication that the diagram includes a load development ladder.
• L3/CL
  Displays the inserted case length.
• L6/OAL
  Provides the inserted or calculated overall length of the cartridge.
• seating debth
  Contains inserted or calculated seating depth (depending on L3 and L6)

• Maximal pressure:
  The highest relevant value calculated is displayed in the diagram split into the chosen steps (in case that a load development ladder is being used)
• Muzzle pressure:
  The calculated value of the muzzle pressure in the determined load development ladder steps (if applicable). The calculated value depends strongly on the inserted barrel length.
• Projectile energy:
  The calculated energy level of the projectile when exiting the barrel in the steps chosen (if a load development ladder is being used) depending on the specific barrel length inserted.
• Muzzle velocity:
  The calculated speed of the projectile when exiting the barrel in the steps chosen (if a load development ladder is being used) depending on the specific barrel length inserted.
• Bullet throughput time:
  The calculated time between ignition and moment which the projectile exits the barrel in the steps chosen (if a load development ladder is being used) depending on the specific barrel length inserted.
• Load ratio:
  The ratio of the volume of the powder charge over the inserted inner case volume in the diagram depending on the caliber and chosen steps (if a load development ladder is being used)
• Burnt propellant:
  The burned powder percentage in the diagram which is used for the acceleration of the bullet before it leaves the barrel.
• Effective efficiency:
  The ratio of the kinetic energy contained at the muzzle in the projectile and the theoretically available energy of the powder mass used.
• IPSC factor:
  The IPSC factor is calculated from the product of bullet weight (grains) multiplied by the average muzzle velocity (feet per second) divided by 1000

The powder burn-up characteristics are mathematically simulated with so called form functions. The GRT uses a three-stage image for the display. Each step is colorized individually in the vivaciousness diagram. The powder burn-up characteristics and vivaciousness of each powder type are taken from validated data sets provided by the original powder manufacturers and form the base for the diagram calculation. The illustrated graph is the result of a GRT-specific simulation taking the previously mentioned data sets as an input. The hereby calculated figures represent the powder values used for the following inner-ballistic simulations.

See also: Formalism, Sources & Powder model

A point-and-click tab-sequence which (if selected) shows the powder volumes (in grain values) of the load development ladder in the chosen steps. When clicking on the volume values, the corresponding graph in the diagram below is selected.

Responsive diagrams (multiple graphs if a load development ladder was chosen) displaying pressure in the barrel, bullet energy and velocity as a result of the inner-ballistic simulation. Caliber, projectile and powder values determine the results of the previous simulation. Corresponding values are being displayed in a context menu when hovering over the graphs.