TECH Tip – Powder Grain Shapes – What You Need To Know

April 10, 2022TECH Tip: Powder Grain Forms — What you Need to KnowPOWDER GRAIN SHAPES — What You Should KnowThe shape and velocity of powder grains have a significant impact on their performance. There are many powder shapes, including flake, ball and extruded (both solid or perforated) types. All Vihtavuori powders for reloading are of the single-perforated extruded stick shape. The composition, size and wall thickness of the cylinders, as well as the composition, will all affect the burning rate. Multi-perforated grains can be found in cylinder extruded powders. The 7- and 19 perforated varieties are the most popular. Multi-perforated powder grains are naturally larger than those with one perforation and are used for large caliber ammunition. The ball grains are used in automatic firearms, but also in rifles or handguns. Because it is not pressed into a cylindrical shape, the ball grain is more affordable to produce. Flake-shaped grains are used in shotgun loadings. In gunpowder terminology, web thickness is the minimum distance the combustion zones can travel within a powder grain without coming across each other. This distance is defined as the distance between the combustion zones in spherical powders and the powder grains. In flake powder, it is the thickness of flake powder. In multi-perforated extruded powders, it is the minimum distance between the powder grains. Wall thickness) between the perforations. This determines the burning rate of powder made of grains that have not been perforated or treated. A form function describes the change in the surface area of the grain that is burned during combustion. The form function is progressive if the surface area increases. If the form function decreases, it is called degressive. If the flame area remains constant during the combustion process, it is called neutral behavior. The cylindrical, perforated powders are also progressive. As the surface area increases, the pressure builds up slowly until it reaches its peak, at which point it collapses. Degressive flakes and ball grains are powders whose total surface area and pressure are at the peak at ignition. They then decrease as the combustion progresses. It can be said that powder which burns slowly achieves the desired muzzle velocity at a lower maximum pressure than powder that burns evenly. The maximum pressure moves towards and towards the muzzle as grain size increases. This also increases muzzle blast. The amount of powder or loading density can adjust the muzzle velocity and pressure, i.e. The relationship between the powder mass (in grams) and the volume that is available to it. Maximum pressure increases as the loading density rises. This article originally appeared on Vihtavuori Website.
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