by 
kuyakev
ANSWERS: 9
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Generally, yes.
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from what i know, yes
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As it makes sense yeah.
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I tested a Rem 700 Tactical .223 fitted with a AWC Raider can and it averaged a 50 fps loss.
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NO this is not true, for sine waves in the muzzle upon entering the baffles in the sound suppresor start to bounce back at each other cacelling the sound waves out, changing sound energy into heat energy thus increasing muzzle velocity by 30 plus feet per second.
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Depending on the type of "silencer" or baffle, yes. There are types that slowly disipate the gas in the barrel and this will decrease the velocity. These are also designed to reduce the speed of the bullet so the sonic "crack" is no longer there. There are types that disipate the gas after it leaves the barrel so the bullet will have achieved full muzzle velocity and are designed to reduce the "bang" of leaving the muzzle.
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Not only does it lower the velocity but it also changes the sighting and how the weapon works. This is due to the extra weight at the end of the barrel. A heavy barrel with more lugs to lock the bolt will have less negative effect. A lighter barrel and a simple locking system will be more effected. A weapon that fires with an open bolt will be less effected. But as far as velocity goes it really depends on the suppressor and weapon, round, barrel lenght.....
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The current top answer (+17) is WRONG!! Best put by surefire: "A suppressor increases the bullet's velocity, by about 30 to 50 fps, because the extra length of the can behaves somewhat like additional barrel length. While the gas seal behind the bullet is not bore-size tight, the hole in the suppressor is only a few thousandths over bullet diameter, allowing a bit more opportunity for the propellant gases to accelerate the projectile. By comparison, an extra 5" of rifled barrel might add 200 fps to 300 fps while 5" of can will only up the velocity about 30 to 50 fps." Unless you're using wipes (uncommon, inaccurate and perishable) or an older integral style with a ported barrel to slow down supersonic rounds (also uncommon), suppressors typically increase velocity ("freebore boost"). You may see a further increase in freebore boost as the suppressor heats up (burning propellant faster in the process). If your suppressor is slowing velocity, you should probably contact the suppressor manufacturer (assuming it's not an old design).
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Most modern suppressors do not change the point of impact of the bullet at moderate ranges. the best do not change it even at long ranges. they are tuned to reduce sound while maintaining velocity. Some suppressors systems are designed to bleed off gasses through barrel ports to reduce the projectile velocity below the speed of sound. This is done intentionally to eliminate the sonic crack of the bullet and not to reduce the sound of the gunshot which is done with a series of baffles in various patterns. Truly quiet guns are a combination of subsonic ammunition and state of the art suppresors. Suppressors also have a negative effect on guns which are gas operated, ex. AR-15. The increased back pressure from the suppressor will cause an increased cyclic rate and more vigorous bolt action. Gas operated guns designed for use with suppressors usually have an adjustable gas system to accomodate this effect.
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