Remington also changed the manufacturing of. Remington applied the new priming system to all of their rimfire cartridges. He said Remington has seen their consumer complaints for rimfire misfires dwindle to near zero since the change was implemented, several years ago. Nick said it was long enough ago, he suspected all of the lots made prior to the change had already been fired. When a firing pin hits the rim, there is no place for the priming compound to go, and it is crushed, initiating the correct ignition sequence. To solve the problem, Remington changed the priming process so the priming compound covered the entire base of the cartridge case. Instead of being crushed in the rim, the compound would be pushed to the center of the shell, creating a misfire. When a firing pin would hit the rim of the case, sometimes, some of the priming compounds would separate. Remington changed the way they prime all rimfire cases based on what they found. 22 Long Rifle cartridges in general and this cartridge in particular. Nick provided information about the changes made to Remington. He has been with Remington through some difficult times. 223 caliber bolt-action rifle firing low-velocity (subsonic) ammunition using a GEMTECH G5-5.56 suppressor.Ĭompared to the high-velocity (supersonic) unsuppressed condition, the combination of subsonic low-velocity ammunition and a firearm suppressor provided a reductions of 45, 38, 40, and 48 dB, peak sound pressure level at the muzzle, left, right ears and behind the shooter, respectively.Nick Sachse, who has been with Remington for 30 years, was glad to talk with me.

The peak sound pressure levels of a Remington 700. 223 caliber bolt-action rifle firing high-velocity (supersonic) ammunition using a GEMTECH G5-5.56 suppressor. Specific reductions depend on the ammunition and suppressor. Main article: Suppressor § Subsonic ammunition and reduced sonic signatureĬombined with firearm sound suppressors, subsonic ammunition may significantly reduce sound levels compared to normal ammunition. These are designed from the start as dedicated subsonic projectile systems. 45 ACP ammunition load, of a 230 grain bullet at 850 feet per second, is naturally subsonic.Īlternatively, specialized firearms and ammunition may be used to optimize total subsonic ammunition effectiveness. For example, the traditional American military standard. Some ammunition types were inherently designed with heavier, slower standard bullet weights and velocities. Subsonic ammunition with normal bullet weights often fails to properly function in such firearms. Subsonic loads for 9mm commonly use 9.5 grams (147 gr) bullets at velocities of 300 metres per second (980 ft/s).įor these ammunition loads, balancing bullet weight and velocity are required to ensure that the ammunition will still reliably cycle semi-automatic firearms. In this instance, heavier bullets are loaded in standard ammunition, which reduces muzzle velocity below the speed of sound.Īs an example, the very common 9×19mm Parabellum standard military round is a 7.5 grams (116 gr) bullet at velocities typically around 360 metres per second (1,200 ft/s). Standard calibers Subsonic versions of standard rounds 1.1 Subsonic versions of standard rounds.

Subsonic rounds 22