03-10-2018, 09:45 PM
Bill A. and Ray from ThunderBeast did some testing with Ultra 7 and Ultra 5s, 30 and 6.5mm.
The feeling was that the 6.5mm were more quiet at the muzzle, but increased supersonic noise through the gas vents in the carrier.
The 6.5mm cans will also increase your back-pressure, creating more plug dwell time behavior, which increases cyclic rate and will unlock much earlier.
For that reason, I went with 30 Cal Ultra 5.
The difference in db rating between the Ultra 7 and Ultra 5 was barely measurable, with overlap in the testing. Ray posted videos of this.
The 6.5mm cans make a lot of sense on bolts guns, as they drop the noise measurably on a sound meter.
The feeling was that the 6.5mm were more quiet at the muzzle, but increased supersonic noise through the gas vents in the carrier.
The 6.5mm cans will also increase your back-pressure, creating more plug dwell time behavior, which increases cyclic rate and will unlock much earlier.
For that reason, I went with 30 Cal Ultra 5.
The difference in db rating between the Ultra 7 and Ultra 5 was barely measurable, with overlap in the testing. Ray posted videos of this.
The 6.5mm cans make a lot of sense on bolts guns, as they drop the noise measurably on a sound meter.
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