08-25-2016, 02:49 AM
While the 6.5 Grendel has a lower working pressure, the propellant volume is much larger than .223 Remington, driving much heavier projectiles, so port pressures actually are really close to each other, enough so that not only are the same port locations appropriate, but gas port diameters line up well also.
The ELGS +2" is more suitable for cartridges with higher case capacity, like .260 Remington and 6.5 Creedmoor, not 6.5 Grendel.
RLGS + .0935" port works just fine with 20-24" barrels on the Grendel.
Secondary pressure events are only seen with cheap gauges when using RSI. Upgrading guages eliminates the secondary event, and you don't see it with piezoelectric metering systems to my knowledge, so non-issue.
There definitely was valid and extensive research done on the best gas systems for barrel length when Bill A. did the years of work that it took to RDT&E 6.5 Grendel. For example, in just one lot of 200 barrels with different chamber designs, none of them performed to his expectations, and a lot of money was spent learning hard lessons about what would and would not work.
He also traveled with several guns to different climates and dust conditions to work out potential problems more like what you would see with a military rifle trials regimen, not a backyard hobbyist with a new reamer and some shop tools.
When you actually look at it, I doubt there has ever been a chamber design that was tested as thoroughly as 6.5 Grendel. What other lab of engineers has tested over 120 different reamer designs for just one eventual chamber that gained SAAMI approval?
The ELGS +2" is more suitable for cartridges with higher case capacity, like .260 Remington and 6.5 Creedmoor, not 6.5 Grendel.
RLGS + .0935" port works just fine with 20-24" barrels on the Grendel.
Secondary pressure events are only seen with cheap gauges when using RSI. Upgrading guages eliminates the secondary event, and you don't see it with piezoelectric metering systems to my knowledge, so non-issue.
There definitely was valid and extensive research done on the best gas systems for barrel length when Bill A. did the years of work that it took to RDT&E 6.5 Grendel. For example, in just one lot of 200 barrels with different chamber designs, none of them performed to his expectations, and a lot of money was spent learning hard lessons about what would and would not work.
He also traveled with several guns to different climates and dust conditions to work out potential problems more like what you would see with a military rifle trials regimen, not a backyard hobbyist with a new reamer and some shop tools.
When you actually look at it, I doubt there has ever been a chamber design that was tested as thoroughly as 6.5 Grendel. What other lab of engineers has tested over 120 different reamer designs for just one eventual chamber that gained SAAMI approval?
NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com