08-25-2016, 03:02 PM
That's interesting info. The lowest pressure to cycle I've found is 10K but everything I've seen is anecdotal. I think the original specs called for a rifle length at 12.7K, but again a longer dwell would allow for less pressure than the 12.7K to operate in 223/5.56 so that would even allow longer tubes on longer barrels for that cartridge.
Even though Grendel operates at lower chamber PSI, there is more pressurized gas in the barrel than 223/5.56, as evidenced by significantly higher muzzle energy.
The more I think about this, the more ways I can think of testing to determine the correct gas tube lengths for cycling. It just seems that there would be a study somewhere that would help. Efficient operation should be a major focus, and the routine acceptance of overgassing doesn't make sense considering the popularity of the platform.
Even though Grendel operates at lower chamber PSI, there is more pressurized gas in the barrel than 223/5.56, as evidenced by significantly higher muzzle energy.
The more I think about this, the more ways I can think of testing to determine the correct gas tube lengths for cycling. It just seems that there would be a study somewhere that would help. Efficient operation should be a major focus, and the routine acceptance of overgassing doesn't make sense considering the popularity of the platform.