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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="QuietTexan" data-source="post: 2439961" data-attributes="member: 116181"><p>You beat me to it. Time is a factor in all of this, and there is gas that leaks around the bullet before it fully engraves, and even some that moves down the neck of the case before it fully seals. Interior ballistics is a science, but variations in each case, chamber, and bore introduce uncontrollable variables that can only be accounted for experimentally. Two identically chambered barrels with identically made rounds will run at different velocities, and there's no practical way to determine ahead of time which will be faster and which will be slower.</p><p></p><p></p><p>Honestly, it depends a lot on statistics also. Someone here earlier said that averages are averages, but that's not really true in the sense that the arithmetical mean is not a robust statistic and is vulnerable to influence by outliers. The very small amount of relative velocity increase (0.2% in my loads) is so minimal that the sample size to have any reasonable confidence in the answer would be hundreds of rounds. To the point it's not feasible to quantify fully because the barrel and chamber will likely change over that number of shots and introduce more uncontrollable variables. 20 shots wasn't enough with those loads. Maybe if I can shoot a real 40-shot 5-SD string I'd be getting up into the numbers where the ranges tighten up, but that's rare and difficult.</p><p></p><p>A lot of us see very, very slight increases, but nothing that makes a practical impact. Repeatability of POA/POI shift is much more important when using a can IMO.</p><p></p><p>I've intentionally tested the velocity change of suppressor, recorded data that shows an increase in velocity, and I still don't think it's statistically significant. Same way that I've tested and show a decrease in velocity from seating further away from the lands, but it has the same problem of the sample size is too small to be reliable.</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2439961, member: 116181"] You beat me to it. Time is a factor in all of this, and there is gas that leaks around the bullet before it fully engraves, and even some that moves down the neck of the case before it fully seals. Interior ballistics is a science, but variations in each case, chamber, and bore introduce uncontrollable variables that can only be accounted for experimentally. Two identically chambered barrels with identically made rounds will run at different velocities, and there's no practical way to determine ahead of time which will be faster and which will be slower. Honestly, it depends a lot on statistics also. Someone here earlier said that averages are averages, but that's not really true in the sense that the arithmetical mean is not a robust statistic and is vulnerable to influence by outliers. The very small amount of relative velocity increase (0.2% in my loads) is so minimal that the sample size to have any reasonable confidence in the answer would be hundreds of rounds. To the point it's not feasible to quantify fully because the barrel and chamber will likely change over that number of shots and introduce more uncontrollable variables. 20 shots wasn't enough with those loads. Maybe if I can shoot a real 40-shot 5-SD string I'd be getting up into the numbers where the ranges tighten up, but that's rare and difficult. A lot of us see very, very slight increases, but nothing that makes a practical impact. Repeatability of POA/POI shift is much more important when using a can IMO. I've intentionally tested the velocity change of suppressor, recorded data that shows an increase in velocity, and I still don't think it's statistically significant. Same way that I've tested and show a decrease in velocity from seating further away from the lands, but it has the same problem of the sample size is too small to be reliable. [/QUOTE]
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Does A Can or Suppresor Increase Back Pressure and Decrease Velocity??? Well????
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