black powder pressure calculation

The Pressure value used for each caliber happens to be the maximum SAAMI safe chamber pressure. Example Calculations 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. It is not unusual to have residual pressure at the muzzle of shorter barrels. This translates to a typical pressure range of 8psi – 16psi. 1 gram = 15.432 grains = 0.564 drams. Randy Wakeman on Muzzleloading Pressure, Recoil, and Velocity. 100 gr. The maximum load capacity is 25 grains of GOEX Black Powder when using a 130 grain conical. (3) Over Powder Wad Recommended . It includes pressures for both black powder and smokeless loads. it has a .58 caliber straight rifled barrel, with a 28 gauge chamber. The peak pressure may be no higher, but the pressure stays up past the point where the barrels thin down, which is just where the fingers usually are. There are 256 drams in a pound avoirdupois, 16 drams in an ounce, and 7000 grains in a pound. Chart 1 converts weights of Black Powder (Goex FFg) to volume equivalent weights of American Pioneer Powder FFg, Hodgdon 777 … That is one of the reasons old Damascus barrel shotguns blow with smokeless powder. The design pressure is determined by the desired net force on a surface divided by the area of that surface. For some reason, these three factors are often thought to be directly related, whether the muzzleloading propellant of choice is black powder, Pyrodex, Triple 7, or smokeless powder used as a black powder substitute. Volumetric measuring of blackpowder has never been accurate, and it isn’t today. This chart converts to weights of equivalent volumes. For instance, a few black powder cartridges, such as the .50-70, were tested using the traditional charges under lead bullets. Weights were rounded to the nearest .1 gr. is 1.0 cc. But powder scales measure weight. Trail Boss was developed as a Cowboy action shooting powder. Duplicating results closer than the nearest grain using BP and subs is difficult and unnecessary. 1.0 cc. Black powder is a low grade explosive, and will swat the base of an undersized soft lead alloy bullet to cause obturation while a smokeless charge with the same peak pressure will usually blow by the base, causing gas cutting and leading. hi everybody, i was just wondering, is it possible to calculate black powder loads for a certain rifle? 15 gr. Volume of APP FFg weighs 85.0 gr., and 100 grl. You can only fit 30 grains of GOEX Black Powder into the chamber with an 80 grain ball. The compressibility of Pyrodex offers a significant advantage in revolvers. The American Rifle by Townsend Whelen (1918) mentions the operating pressures of many of the commercial cartridges then available. Also, black powder … The avoirdupois dram is the unit of weight used to measure black powder. Pressure (psi) Load Density (1) Indicates Maximum Load (2) Dacron ˜ller used. i own a 1874 swedish rolling block. Black powder pressure actually peaks sooner than smokeless, even if the maximum pressure is no higher. weighs approximately 15 gr. By Randy Wakeman. Black Powder Loads are normally measured in volume. Volume 777 FFg weighs 73.3 gr. Don't know about Nitro content, but it is very bulky for weight. These are all weight measurements, and always have been. vol. Typical net force values for a 4 inch diameter rocket range from 100 lbf – 200 lbf. The maximum load is 23 grains GOED Black Powder with a 160 grain conical. The IMR4759 will give black powder velocities with less pressure than black. Charges listed are 100% density, no compression. 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