Hornady Superformance™ ammo in AR's - MP-Pistol Forum

Hornady Superformance™ ammo in AR's

This is a discussion on Hornady Superformance™ ammo in AR's within the MP Rifles forums, part of the Smith & Wesson MP Forum category; I was just made aware of this, there can be a serious problem using Hornady Superformance™ ammo in AR-15's with carbine or mid length gas ...

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Old April 29th, 2012, 01:58 PM   #1
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I was just made aware of this, there can be a serious problem using Hornady Superformance™ ammo in AR-15's with carbine or mid length gas systems. Hornady Superformance™ ammo runs higher than normal pressures and can overload the gas systems in AR's with shorter gas systems, this can result in damaging the gun. The photos show a Bushmaster carbine that KB'd on Hornady Superformance™ 75 gr factory loads.

Due to the longer duration of peak pressure produced by Superformance™, the post peak/declining port pressure at common carbine and mid-length gas port locations is still higher than that produced by standard propellant. This has a tendency to flood the system with a larger volume of gas, at a higher velocity, that tries to open the bolt of the gun too fast. It’s a timing issue. The cartridge case is still swollen from the application of pressure during firing while the gun is simultaneously trying to extract the cartridge case before it has had an opportunity to settle back to its original size, or more simply: the gun is still in the process or firing while it’s trying to extract the cartridge case.

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Old March 14th, 2013, 07:19 AM   #2
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I know this is an old post. Some friends and I are trying to "fine tune" our MSR's. Switching to adjustable gas blocks and "playing" with different buffers. 75 grain is a heavy bullet to be pushing down the barrel,an adjustable gas block "might" have helped prevent this. "We" have found 53-55 grain bullets are the better in the S&W 1in8 5R melonite barrels. One is popping PDogs at 250 yards... "Pushing bigger and harder" doesn't seem to be an answer.
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Old March 14th, 2013, 07:27 AM   #3
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Typical Hornady, putting out crap and calling it performance.
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Old June 25th, 2013, 01:09 PM   #4
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Is this only an issue with the 75gr? I have 100 rounds of the SuperPerformance 55gr, should I refrain from putting it through my M&P-15?
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Old June 25th, 2013, 04:17 PM   #5
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Gee. Hornaday Super in an AR? Kinda 'spensive shooting.
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