Bolt thrust or breech pressure is a term used in internal ballistics and firearms (whether small arms or artillery) that describes the amount of rearward force exerted by the propellant gases …

Mar 15, 2017 · Does the Ackley improved case design actually reduce bolt thrust? Find out in this excerpt from Fred Zeglin's new book on P.O. Ackley.

Jan 23, 2015 · Bolt thrust is fairly simple to calculate and depends on the inside diameter of the cartridge case being fired and the chamber pressure. Also of interest, but not necessarily …

Oct 17, 2013 · "Bolt thrust" is a very real factor, and is directly proportional to the gas pressure generated and the area of the case head supported by the bolt or standing breech.. …

Nov 1, 2013 · My purpose in making up the chart was to evaluate the modern pistol calibers loaded to SAAMI spec levels and what bolt thrust those produced as compared to those …

Jul 19, 2016 · The force applied to the bolt face is typically referred to as bolt thrust. Bolt thrust is present even if the pressure is within tolerance and all aspects of the cartridge are performing …

Jun 26, 2016 · In the first article discussing the mechanisms by which a firearm locks its breech, we mentioned briefly two quantities that are important for small arms design: Pressure, and …

Jun 15, 2005 · A gentleman on another thread here recently quoted the bolt thrust on a BMG 50 at 24000 lb. This is the kind of information that can save either a lot of overbuilding or tragic …

Feb 8, 2020 · Keeping things basic, the bolt thrust is the perk pressure times the area of the case at the web. The case is basically a piston operated on by the gasses at chamber pressure. A …

May 22, 2021 · Case head thrust is controlled by the weight of the bolt and strength of the recoil spring(s). It's an engineering balancing act. Getting the rate of fire to fit design parameters …