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The .277 Fury or 6.8×51mm Common Cartridge [4] [5] (designated as the .277 SIG Fury by SAAMI) [1] is a centerfire rimless bottlenecked rifle cartridge announced by SIG Sauer in late 2019. [2] Its hybrid three-piece cartridge case has a steel case head and brass body connected by an aluminum locking washer to support the high chamber pressure ...
The new 7-mm .277 Fury round will be deployed both in an infantry battle rifle as well as in a dedicated machine gun and exemplifies the requirement of the much higher chamber pressure, 80-90,000 PSI Vs 55-60,000 PSI in the older ammunition required to attain the demanded ballistic performance with a 7-mm bullet in both weapon systems.
Within firearms, chamber pressure is the pressure exerted by a cartridge case's outside walls on the inside of a firearm's chamber when the cartridge is fired. The SI unit for chamber pressure is the megapascal (MPa), while the American SAAMI uses the pound per square inch (psi, symbol lbf/in 2) and the European CIP uses bar (1 bar is equal to 0.1 MPa).
Other benefits of the SAAMI conformal transducer are: very adaptive to the high volume quality control testing demands of commercial and law enforcement ammunition production; protection of the transducer from direct exposure to the high temperature combustion gases and hence a comparatively long service life; 80,000 psi (551.6 MPa) maximum ...
Chamber Pressure Measurement by Terry Hart; Chart of SAAMI pressure levels for common cartridges, in PSI or CUP. A study Archived 2007-08-20 at the Wayback Machine done that shows a statistically significant correlation between CUP and PSI for rifle cartridges. Speer Reloading Manual Number 11, Omark Industries, 1987 [ISBN unspecified]
Bullet's Brinell hardness number (BHN) x 9.80665 N/kgf×10 6 mm²/m² = [N/m²] = pressure in pascals Bullet's BHN x 1422 = pressure in pounds per square inch [3]. The conversion factor of 1422 is mathematically derived in order to convert the pressure in kgf/mm 2 (the units used to measure BHN) to lbf/in 2 (the units used to measure cartridge pressure).
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.277 FURY.277 Wolverine.28 Nosler.280 Ackley Improved.280 British ... Cartridge and reloading info can be found at Accurate Reloading This page was last ...