2012年2月13日 · Shown in the table below are a few sample calculations of both Projectile Velocity and Barrel Pressure for the 9mm, .357 magnum, .44 magnum, .45 ACP, .223 / 5.56 NATO, .308 / 7.62 NATO, and .50 caliber BMG using CFR's derived method. The Pressure value used for each caliber happens to be the maximum SAAMI safe chamber pressure.

2012年9月14日 · Plotting a load’s pressure/distance curve helps designers of gas-driven autoloading rifles because these rifles must tap the gas at some point in the bullet’s travel. Too much pressure, and the slamming can damage rifle parts.

2024年2月18日 · A pressure curve in firearms refers to the internal pressure produced by the burning propellant as it pushes the bullet through the barrel. This curve is important for determining the safety and performance of a firearm.

The action time (hammer hits the primer to peak pressure) is the yellow line, the pressure curve is the blue line. A second example of a pressure curve (Blue Line) showing an initial pressure spike from primer ignition to to peak pressure.

2016年6月26日 · Over the course of the firing cycle, pressure in a firearm will increase rapidly and then decrease more gradually, and the graph of this change in pressure for a specific load of ammunition is called its pressure curve. Over the course of the pressure curve, several notable highlights occur: These include the maximum pressure, which is the ...

2019年8月16日 · Burn rate should be called pressure curve. Faster powders generate peak pressure very quickly which is why they work with light bullets or shorter barrels (in rifles anyways) and the particular data may not show just how fast that curve is climbing.

2016年8月19日 · Over the course of the pressure curve, several notable highlights occur: These include the maximum pressure, which is the highest pressure level on the curve, the uncorking pressure, which is the pressure as the bullet is leaving contact with the rifling, and – in the case of weapons with gas systems – the gas port pressure, which is the ...

More powder can also be used in rifle cartridges because the bullet chambers can be designed to withstand greater pressures (50,000 to 70,000 for rifles psi vs. 30,000 to 40,000 psi for handgun chamber). Higher pressures require a bigger gun with more recoil that is slower to load and generates more heat that produces more wear on the metal.

Closely inspecting the base-pressure curve plotted against time in a good interior ballistics application such as QuickLOAD©, we see that it does indeed appear distinctly Gaussian in its excitation profile, having a “standard deviation” spread function, Sigma(μ-sec), given by its rise time in microseconds (μ-sec) from 60.65-percent to 100-percen...

2016年1月1日 · There are a few surefire things that will alert you when your rifle is exhibiting “over-function” symptoms, such as spent-case condition showing excessively blown (extended) case shoulders, extractor marks on the case rim, and a …