Thread: Pushing 308 to 300WM speeds.

Originally Posted by Lauries Hut

QL pressure I take is an estimated pressure from the Quick Load tables.
How were they getting the corrected pressure number?

Greetings @Lauries Hut,
The relationship between velocity and pressure is quite linear as it is between powder charge (for the same powder) and velocity. This can be demonstrated with the Hodgdon load tables and a pocket calculator or a graph. I use the same methods but I am looking for a safe load at less than maximum pressure where the vid was demonstrating the fallacy of working up using pressure signs. For many cartridges the book data is right on the button once barrel length has been factored in. Some powders and some projectiles give quite different results due to a change in powder speed or projectile construction. I differ from some in I prefer to base loads on published and pressure tested data rather than Quickload which is an estimate based on case capacity. Correcting a velocity based on an estimate is still an estimate.
Regards Grandpamac.