Thread: Speed vs pressure

Greetings Cigar and All,
The answer is yes, sort of. John Barsness did an excellent article in Handloader a while back. He found a strong relationship between velocity and pressure and worked up loads with a chronograph with data for the same powder and projectile. As far as cases go a heavier case will have less capacity and will give more velocity and pressure but the same velocity will be close to the same pressure. Cases can vary widely in weight for the same cartridge. I weigh batches of cases prior to loading. Primers are different. Some primers develop more pressure without increases in velocity. I would be careful using Winchester primers, especially their magnum type with stick powders unless listed in the data. I believe that Winchester primers have been formulated for the harder to ignite ball powders. Projectiles are very different. Only data for homogenous projectiles should be used with them. The data is often several grains below that of soft projectiles like the Hornady Interlock. Data for the heavier jacket projectiles like the ABLR is often lower as well so again use the data for those projectiles.
Regards Grandpamac.