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