Load the .grtload file you want to add data to. This is the file that holds the load
(case, projectile, powder, gun). The tool never changes anything outside the measurement block, so
every input value stays exactly as you saved it in GRT.
Enter one charge and its measured velocities. Paste velocities one per line; commas and blank lines are ignored. For a ladder, add a charge for each step. GRT recalculates the average, ES, and SD when it opens the file. The values below are for your own confirmation only.
Generate the new file, review the measurement block below, then download. Open it in GRT and use the OBT screen only to calibrate Ba and k against your measured velocities.