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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 Rifle Pressure Specifications (Maximum Average pressure) All Piezo measurements unless specified) Cartridge: Pressure (Max Avg) Cartridge: Pressure (Max Avg) 5 mm RFM: 37,000.30-30 Winchester . 42,000.17 Rem: 52,000 cup.30-06 Springfield . 60,000.22RF Short . 21,000.30-30 Winchester (Saboted)
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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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May 21, 2010 · Bullet BHN / "Minimum" Chamber Pressure For Lead Alloys (PSI) The formula (from the pages of HandLoader Magazine) to determine at what pressure an alloy of given BHN will obturate the base of the bullet and seal the bore.
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Jun 22, 2012 · .223 Remington ammunition is pressure tested in what is called a "SAAMI Minimum Spec" chamber – that is, a "worst case scenario" chamber in this regard, made to the smallest dimensions, which would result in the highest pressures with any given ammunition.
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May 08, 2006 · That is near the pressure at which brass starts to flow. Cartdidge size does not have any affect on the properties of the brass. To calculate the stress in the locking mechanism, you would use the peak pressure developed and the area of the base of the cartridge to determine the bolt thrust.
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Jan 09, 2011 · Testing Firearms: Measuring Chamber Pressures In this post, we will look into the technique of measuring pressures inside a barrel, when a firearm is discharged. It is important for people to determine pressures of a firearm with various types and .
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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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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.
[PDF]GET PRICE >>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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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 .
GET PRICE >>Sep 14, 2012 · Bullet Ballistics: CUP. Copper units of pressure (CUP) and lead units of pressure are not the same; nor can they be interchanged with another common unit of pressure, pounds per square inch (PSI). 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.
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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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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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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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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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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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Important Information About Shotshell Pressures. SAAMI tells us that whether using 2¾-inch or 3-inch 12-gauge loads, the maximum allowable pressure level of such shells is 11,500 psi. In this gauge and shell lengths, by the way, SAAMI provides for a mean average .
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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.
GET PRICE >>Jan 09, 2011 · Testing Firearms: Measuring Chamber Pressures In this post, we will look into the technique of measuring pressures inside a barrel, when a firearm is discharged. It is important for people to determine pressures of a firearm with various types and brands of ammunition, because some ammunition may produce too much pressure .
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Apr 18, 2015 · Copper Unit of Pressure (CUP) Defined by Hodgdon. A: Copper Unit of Pressure (CUP) is a measurement used in the ammunition industry to determine the chamber pressure created by a cartridge load. Originally, a precisely formed copper slug was placed in a fixture over the chamber. When the cartridge was fired, the amount of crushing measured on...
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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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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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May 12, 2004 · There are pressure ranges where the PSI readings can be close the the CUP readings but it is really nothing to stake any accuracy on. Also, the Piezo method for measuring chamber pressures on an oscilliscope, also measures peak pressure DURATION.
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Dec 30, 2010 · But I was just curious if max or slightly over max loads in .223 would be safe to shoot in a true 5.56 chamber? Just as an example, say that a book lists a .223 max load and that load has 53,000 psi. Could it be assumed that because that load has 53,000 psi and is a "hot" .223 load, that it would be a "medium" load in a rifle with a true 5.56 ...
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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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Sep 29, 2012 · The specs from Finland to both the US military and to Ruger included an average chamber pressure limit of 45,000 CUP. Note that the Soviet average chamber pressure limit works out to about 40,000 CUP but later the CIP standard was 45,000 CUP.
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We have chosen to impose a maximum average chamber pressure limit for our 45-70 Hammerhead Ammo of 33,000-cup/35,000-psi. It is often claimed that the Marlin 1895 is completely safe with load levels up to 43,000-PSI, and that the modern Winchester 1886 is safe to 50,000-psi.
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The crusher loads were set to max between 47,000 and 48,500 CUP, just under the SAAMI max of 50,000 CUP. Transducer testing showed that the same loads fell between 56,700 and 58,500 psi, just under the 60,000 psi limit for the same cartridge. No changes in published data were needed.
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Jun 03, 2009 · CUP=Copper Units of Pressure. CUP was the standard for ammo before PSI. A copper crusher barrel held a small disc of copper that would be crushed when the round was fired. It was then measured and compared to a chart to come up with the pressure. There is .
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