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Metallic Cartridge Chamber Pressure Measurement

To this day, most published chamber pressure (MAP) data for metallic cartridges is taken by the copper crusher method of measurement. The proper name for this type of measurement is CUP, or Copper Units of Pressure. Another, similar, method uses lead crusher pellets and the resulting pressure values are called "Lead Units of Pressure," or LUP.

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7.62x51... the real facts! - M14 Forum

Aug 16, 2010 · And since I reload that unimportant technical spec called chamber pressure is very important to me. There is a huge difference between 50,000 CUP and 50,000 psi.

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Important Information About Shotshell Pressures - Shotgun Life

The pressures SAAMI is concerned with are exclusively chamber, not down-barrel pressures. The accompanying table outlines SAAMI's current pressure standards. The current method adopted by SAAMI for shotshell pressure measurement is to use the piezoelectric transducer system and then to express pressures so measured in pounds per square inch ...

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Max safe pressures(CUP) for M1A - M14 Forum

Sep 21, 2009 · Max safe pressures(CUP) for M1A What are the max pressures that an M1A is capable of safely handling? According to the new Hornady manual, .

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CUP vs. PSI — What's The Difference in Pressure ...

Oct 13, 2014 · CUP Pressure Measurement The CUP system uses a copper crush cylinder which is compressed by a piston fitted to a piston hole into the chamber of the test barrel. Pressure generated by the burning propellant causes the piston to move and compress the copper cylinder. This will give it a specific measurable size that can be compared to a set standard.

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A Powley Computer for Handloaders -

For powders 3031 and slower, the Pressure estimate will be about 43,500 CUP, and this can be taken to be the target pressure of the Load Computer. For the faster powders, the Pressure estimate is about 40,000 CUP, suggesting Powley wanted a more conservative load with these.

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Ammo pressure comparison - Ruger Forum

Apr 05, 2011 · In all pistol cases, chamber pressure will be higher than in revolver cases designed for black powder. Again, SAAMI sets the standards based on the designer or inventor's input. Chamber pressure can be very misleading because it does not directly correlate with power or velocity, rather it is a complicated combination of powder burn rate, bullet weight, bullet diameter, and case volume.

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Loads vs SAAMI max pressure | The High Road

May 17, 2007 · The 7mm mag is rated at 52,000 CUP or 61,000 PSI which isn`t very low to be honest. The highest pressure of any cartridge SAAMI backs is 65,000 psi.

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Bullet Ballistics 101: Pressure, Velocity & Distance

Sep 14, 2012 · A CUP value may coincide with a PSI value; for example, SAAMI lists 28,000 as maximum average pressure for the .45-70. Both CUP and PSI units apply. But maximum average pressure for the .243 is 52,000 CUP and 60,000 PSI.

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SAAMI Pressure vs. manuals - Ruger Forum

May 02, 2014 · At the time, 357 Magnums had a maximum SAAMI pressure rating of 46,000 CUP. Beginning in 1995, SAAMI approved a new and much more accurate way of measuring chamber pressure using a piezo transducer connected to electronic equipment. This method produces a very accurate measurement and is rated in pounds per square inch (psi).

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9mm Ammo Pressure

Aug 24, 2015 · Chamber pressures are often listed in CUP, PSI, or even PSIA. . 12 Gauge Shotguns · Is There Any Difference Between 9mm Luger and 9mm Parabellum? The 20 gauge Pathfinder Kit is a packaged selection of three inserts; 20 gauge to 22LR, 20 .

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Chamber pressure for .22 Magnum - practicalmachinist

Oct 03, 2004 · That's .17 Remington that shows 52,000 cup chamber pressure, not .17 ..17 Rem is essentially a .223 necked down to .17 cal..17 is a .22 mag necked down to take a .17 cal bullet.

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Simple Trick for Monitoring Pressure of Your Rifle Reloads ...

There is a slick method of checking, along with observing, typical case head pressure signs, that allows the reloader to work up safe maximum loads for each of his favorite rifle cartridges. Simple Trick for Monitoring Pressure of Your Rifle Reloads | Hodgdon Reloading

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Modern Sharps chamber pressures - Shiloh Rifle Forums

Mar 20, 2006 · Modern Sharps chamber pressures. No max pressure can be ruled safe in every rifle, some rifles and brass reach the max pressure at a lower charge and alot shoot better groups at a lower pressure and some at a higher pressure. I have a 45-110 shooting black powder and a lot of the shooters can use 106 grains and more of black powder...

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Calculating Barrel Pressure and Projectile Velocity in Gun ...

Calculating Barrel Pressure and Projectile Velocity in Gun Systems The following information was derived and provided by Close Focus Research (CFR) for those who are interested in Calculating Barrel Pressure and Projectile Velocity in Gun Systems.. Keep in mind that the results rendered by the methods below are based purely on Math and Physics.

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M203 40mm Grenade Launcher - inetres

The burning propellant produces 12,000 psi chamber pressure, which ruptures the brass powder-charge cup at the vent holes and allows the gases to escape to the low-pressure chamber in the cartridge case. There the pressure drops to 3,000 psi and propels the grenade from the muzzle at a velocity of 250 fps.

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Blackhawk chamber pressure | Gun and Game - The ...

Jan 07, 2008 · Many Marlin rifles have a chamber pressure of 40,000 CUP, the Blackhawk in .44 Magnum has the same limit, the Blackhawk in .45 Colt is about 32,000 CUP, according to various gun writers, and I'm just wondering what those thick chamber walls will hold to if ever pressured to do so.

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Chamber pressure chart? - Cast Boolits

May 21, 2010 · CUP is a special unit of measure defined only for ballistic testing; psi is a standard unit of measure for all pressure testing in the English system. Whether you are testing radiator caps or valves for a nuclear submarine, psi is the same.

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Copper units of pressure - Wikipedia

In the avoirdupois system, the units of pressure are pounds per square inch and in the metric system, the units or pressure are newtons per square meter . A chamber pressure measured with a copper crusher gauge would be expressed as psi (CUP) in the English system or MPa (CUP) in the metric system.

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.308 Winchester vs. 7.62x51mm NATO - how-i-did-it

But if you're still not convinced where pressure is concerned, big deal. There's a far better reason not to use .308 Winchester in a 7.62x51mm chamber: It's the Headspace. Safe chamber headspace for the .308 Winchester cartidge is between 1.6300 and 1.6340 inches.

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Good video on CUP (Copper crusher method for chamber pressure)

Nov 20, 2018 · Good video on CUP (Copper crusher method for chamber pressure) If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed.

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