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Old February 13, 2013, 09:03 AM   #7
243winxb
Senior Member
 
Join Date: July 26, 2011
Location: USA
Posts: 1,730
AR and H4198

You wont know till you try it. The gas port pressure curve is a critical part of internal ballistics for cartridges used in gas operated firearms. Gas operated weapons are generally tailored to a narrow range of powder burning rates and characteristics. If the port pressure is too low the weapon will fail to function and if to high the weapon may function too forcefully or rapidly causing extraction or cycling problems. When using the fast H4198, the pressure peaks very fast and is done producing pressure sooner than your slow powders. With such a wide range of bullet weights from 40gr to 80gr, matching the gas port location and size is critical. If the gas port was moved closer to the chamber and drilled larger, H4198 may work. http://www.thehighroad.org/showthread.php?t=502784 40 gr Bullet.
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