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I bought the bulk of my suppressors in 15-16, so my rifles were in service with brakes. I guess I did not document it, but I never saw more than a 10fps either way running one. Then again, I use a magnetospeed, did that change my distance from the muzzle for my bayonet? So were gains mitigated?
This is all great stuff to keep in mind when I move everything to suppressed when I shoot at the indoor range.
Depends on length.
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.
Volume of a cylinder is dependent on link but more sensitive to diameter within practical bounds because pie r squared is the area of the circle and the radius gets squared making the length not quite as important as it might be otherwise but your point is well taken. The length will matter.
Agreed it may just be a measurement that is statistically insignificant in some cases.
The projectile departing the chamber going into the barrel has a shock wave going ahead of it and that's identical with or without a suppressor. That pulse of compressed air being pushed out the barrel has nothing whatsoever to do with the imaginary gas leakage past the projectile. There will be some initial blow by until the projectile is fully sealed into the rifling.
One hole in your theory here.
Your test has me so curious that I'm going to try it on my 6.5 PRC with handloads.
I've been meaning to do it again, it's been two years now since I did that test I think? Just honestly never got back to it, it was such a small difference I basically said "hmm that's weird" and kept working towards other goals.
I'm not sure about the 1/10,000th of a second - propellant burn takes ~4 microseconds, or 40/10,000ths to burn completely. The bullet weight is so much more that there is a very large velocity differential between the pressure front of the gas expansion as it leaves the case and the bullet moving that there's more than enough time for a (WAG) 1%+ of the total volume to bleed around. The gas doesn't only move out of the case after the bullet starts moving, the expansion of the neck off the bullet is part of expansion before the bullet engraves. Gas has time to shoot around the case neck before the case fully seals even though the neck moves enough to release the bullet.
