:dgrin: RE: ejection port noise.
My suppressor's designed for sustained (even full-auto) 5.56 use, so when using it with .22LR, it's VERY quiet. With 'normal' subsonics, the loudest noise literally is the bolt cycling.
However, (comma), using the 60-grain SSS load, the ejection-port noise IS very pronounced, to the point where IT is the loudest thing upon firing; a pronounced "pop". I assume this to be due to the heavy projectile, combined with the blowback nature of the .22 unit's bolt. Assuming similar velocity with this much heavier bullet, in a blowback action, means the bolt's got more force pushing it back, to open and eject; which (again, I assume) means it's opening faster (more force pushing against the bolt than normal). Opening faster means opening sooner after ignition, which means opening with more pressure still in the chamber/barrel; which means more is going to escape out the ejection port.
Also, could be that the SSS is using coarser or slower-burning powder; that could be a factor as well.
I'm no physicist, and the "why" of it are just assumptions on my part. But there's no question that with the 60-grain SSS load, the gun's a LOT louder than with the 38-grain Remington subs I usually use. It's just one of those things you just learn by experimenting; rather than just assume (as I would have) that all subsonic .22's would be similarly quiet.
My suppressor's designed for sustained (even full-auto) 5.56 use, so when using it with .22LR, it's VERY quiet. With 'normal' subsonics, the loudest noise literally is the bolt cycling.
However, (comma), using the 60-grain SSS load, the ejection-port noise IS very pronounced, to the point where IT is the loudest thing upon firing; a pronounced "pop". I assume this to be due to the heavy projectile, combined with the blowback nature of the .22 unit's bolt. Assuming similar velocity with this much heavier bullet, in a blowback action, means the bolt's got more force pushing it back, to open and eject; which (again, I assume) means it's opening faster (more force pushing against the bolt than normal). Opening faster means opening sooner after ignition, which means opening with more pressure still in the chamber/barrel; which means more is going to escape out the ejection port.
Also, could be that the SSS is using coarser or slower-burning powder; that could be a factor as well.
I'm no physicist, and the "why" of it are just assumptions on my part. But there's no question that with the 60-grain SSS load, the gun's a LOT louder than with the 38-grain Remington subs I usually use. It's just one of those things you just learn by experimenting; rather than just assume (as I would have) that all subsonic .22's would be similarly quiet.
