Also, a bolt action rifle has a locked chamber. This way no gasses/ noise can escape the breach before the projectile leaves the muzzle. All gasses are forced to go all the way out the barrel and through the suppressor.
I have red similar statements in couple of threads, and it sounds really wrong to me, knowing that most of the semi-automatic guns, actually semi-automatic pistols, to be more specific, work on a "short recoil operation" principle, which has one specific part to it that affects precision of a gun. Specifically, guns that work on this principle are constructed in that way that power that forces a projectile out of the muzzle, also forces casing to go in the opposite direction, and move on its way slide, compress the spring, eject the casing, reload new bullet, and prepare the gun for a new shot. Now, if the projectile and the casing would start moving in the opposite direction in the same moment, even though the projectile has almost nothing on its way except air and grooves, and casing has slide and spring that make heavier load, and so it seems that the projectile would exit the muzzle before the recoil moves the gun from the aiming position and affects precision of the gun, it actually works differently, and it is an amazing feat of the construction of the guns.
Guns are actually constructed in that way that the casing, and the slide for that matter, stays in its regular (locked) position all the time while the projectile travels from its casing until it exits the muzzle. Angles on the back side of the barrel, the one side that touches the inside of the slide, where the firing pin is, and angles on the slide in that place, are constructed in that way that the force that powder provides for the projectile to exit the muzzle in the speed that it does is also strong enough to create pressure inside of the barrel so strong that slide can not move back. The slide is pressed to the barrel so strong that it can not "slide" from it. So, when the projectile leaves the muzzle, pressure inside the barrel drops significantly, and drops under the threshold that keeps slide in its place, so it than and only then, when the recoil has no effect on trajectory of the projectile, the slide starts to move back, ejects the casing and loads new bullet. Think of it like if you would have so much strength in your hands that you could pull the slide so fast and so strong that it just would not move until you lower the force of pulling the slide and it just then you are able to move it and load your gun. It is purposefully made that way so it does not affect the projectile trajectory, and the calculation of the forces and angles, and weight of different parts of the gun and the bullet in order for it to work properly are, I expect, huge work to fit it all in.
So, in any way, a bolt action rifle, or just a regular gun, or pistol, it does not matter. No gasses/noise can escape the breach before the projectile leaves the muzzle. All gasses are forced to go all the way out the barrel and through the suppressor, whichever weapon you have in your hand. And all this is true even for a gas-operated reloading firearms. They are too constructed in that way that reloading operation does not affect projectile trajectory, and for that to be possible, the reloading operation must start only, and only after the moment that projectile exits the muzzle.
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