![]() When true revolver cartridges are measured for muzzle velocity they are done so with test barrels that include a gap to more accurately represent the revolver. Escaping gasses through this gap when a revolver is fired can reduce a bullet's muzzle velocity. Additionally, when it comes to measuring muzzle velocity a revolver introduces a gap between the cylinder and barrel. So, the true bullet travel through a revolver's 4 inch barrel is actually 4 inches. This is because a revolver barrel is separate form the cartridge chamber. A pistol barrel that measures 5 inches in length includes the 1 to 2 inches of cartridge chamber length, so the true bullet travel through a pistol's 5 inch barrel is closer to 3 to 4 inches.Ĭonversely, a revolver's barrel is measured from its muzzle to the front of the revolver's cylinder. This is due to the fact that a pistol's barrel and cartridge chamber are integrated together into a solid one-piece barrel assembly. When measuring a pistol's barrel length the barrel's cartridge chamber is included in that measurement. The first thing to note is that there is a fundamental difference in the way pistol and revolver barrel lengths are measured. Part 1: Pistol Barrels versus Revolver Barrels Now we will look at how we approximate the cartridge's muzzle velocity (and subsequently muzzle energy and other rankings) by adjusting for the difference between the industry standard test barrel used for obtaining a cartridge's ballistics specifications and the actual handgun barrel from which the cartridge will be fired. In our article " Selecting a Representative Cartridge" we discussed the process for selecting a set of representative cartridge specifications for the 55 calibers used in our database. Finally, in Part 8 we discuss our formula verification process using the real test data from the folks at BBTI, and the formula selection we made based on the results. ![]() ![]() Parts 6 and 7 discuss in detail and explain the muzzle velocity formulas that we discovered in our search, and subsequently tested. ![]() In Part 5 we go over the logic and formulas we plan to implement to get "true" barrel lengths for our muzzle velocity calculations. Our search for a more accurate formula is laid out in Part 4. We also reveal the formula's fundamental flaws and inaccuracies that we plan to address in this project. In Part 3 we discuss and explain the current approximation formula that we developed in-house and have been using for some time. Part 2 is a short discussion about where we get real ballistics data to use in our approximation formulas. That being said, here is a summary of the discussion points in this article for those of you who are just interested in the bottom line: In Part 1 we discuss the difference in the way pistol barrels and revolver barrels are measured and how that affects the accuracy of our approximations for certain handguns. Their real-world tests of muzzle velocities in relation to barrel lengths, and their tests on the impact of revolver cylinder-gap on muzzle velocity were instrumental in validating the accuracy of our approximation formulas. But, unless you are a physics/mathematics/spreadsheet wonk you may not want to make it all the way through this article and associated documentation.įirst, before going any further we want to offer a shout-out and sincere thanks to the folks at (BBTI). We wanted to provide as much information as possible for anyone who had questions about our rationale and methods for approximating muzzle velocities. WARNING - This is a very long article and goes into great detail about how we have been approximating, and how we plan plan to approximate muzzle velocities for the handguns in our database.
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