- How to unlock restricted load data?
- How to redeem discount voucher?
- Create and use wishlist / bookmarks
- How to rate and comment xxl-reloading?
- Powder criteria to be listed in load table
- Why do loads differ from other soures?
- Can I deviate from the load data?
- What is "Filling Percentage", "Fill Rate" or "Load Density"?
- Which saftety standards define the maximum allowed pressure and standard cartridge dimensions?
- What is V(0) and V(0)*?
- What is "propellant combustion" or "powder burnt" or "z"?
- What is the Effective Combustion Chamber Volume?
What is "propellant combustion" or "powder burnt" or "z"?
Propellant combustion is the solid-to-gas conversion of the powder. The metric "z" defines the percentage of the burnt propellant when the projectile leaves the muzzle.
When optimizing a cartridge load through appropriate selection of components, combustion preferably ends before the projectile passes the muzzle. Achieving more than 95% of burnt propellant is considered to be a fair load. This improves energy utilization, ensures consistent results and somewhat influences the generation and appearance of muzzle flash.
- z = propellant combustion for standard barrel length
- z* = propellant combustion for short barrel length