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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Does A Can or Suppresor Increase Back Pressure and Decrease Velocity??? Well????
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<blockquote data-quote="vortech347" data-source="post: 2439203" data-attributes="member: 73645"><p>Yes it does increase backpressure but the slight gain in effective barrel length, IME, has added some velocity. It's not a lot. I've seen 11fps on average out of a 26" 6.5 PRC where my SD is under 10. Obviously, there are a lot of variables. But I've seen the velocity increase the few times I have measured it in more than one rifle.</p><p></p><p>Your muffler analogy has a little merit but there is a pretty big difference between cooling exhaust gases several feet down the system in a car vs. a rifle bullet still heating up and being propelled by powder in a 1-2.5 foot long barrel.</p><p></p><p>Any restriction on cooling and slowing down exhaust gases in a car will have a greater affect IMO.</p><p></p><p>Everyone I have talked to that has actually measured it said the same thing. The can added some velocity.</p><p></p><p>But as another posted stated, you can clearly tell it adds back pressure in a gas gun because the action cycles much harder if you don't have an adjustable gas block to turn it down. I have one of my AR's set to where it just barely cycles without the can so it doesn't beat the gun up with the can. I almost always shoot it with the can.</p></blockquote><p></p>
[QUOTE="vortech347, post: 2439203, member: 73645"] Yes it does increase backpressure but the slight gain in effective barrel length, IME, has added some velocity. It's not a lot. I've seen 11fps on average out of a 26" 6.5 PRC where my SD is under 10. Obviously, there are a lot of variables. But I've seen the velocity increase the few times I have measured it in more than one rifle. Your muffler analogy has a little merit but there is a pretty big difference between cooling exhaust gases several feet down the system in a car vs. a rifle bullet still heating up and being propelled by powder in a 1-2.5 foot long barrel. Any restriction on cooling and slowing down exhaust gases in a car will have a greater affect IMO. Everyone I have talked to that has actually measured it said the same thing. The can added some velocity. But as another posted stated, you can clearly tell it adds back pressure in a gas gun because the action cycles much harder if you don't have an adjustable gas block to turn it down. I have one of my AR's set to where it just barely cycles without the can so it doesn't beat the gun up with the can. I almost always shoot it with the can. [/QUOTE]
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Does A Can or Suppresor Increase Back Pressure and Decrease Velocity??? Well????
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