Does your barrel have a 1:9 or 1:7 twist?
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Why would it be pointless? Breaking the sound barrier does not necessarily indicate a loud sound. It does mean that there will be pressure created, in the case of bullets the volume of this pressure is somewhat small and being pushed out in front and to the sides of the bullet - the shooter will not receive much of that pressure.
On the downrange side of the shot, an observer close to the path of the bullet will hear the supersonic crack but depending on their orientation to the round passing they might be unable to correctly guess the direction the shot was fired from.
One of the main reasons for a suppressed weapon is to mask the origin of the shot to prevent detection and aid in follow up shots.
I've seen a chart that indicated the approximate dB for the supersonic crack of a .308 round fired from 1300fps to 3700fps is right at 140 in all cases measured 10yds from the target line . Therefore lowering the muzzle report from ~160dB to ~130dB with a suppressor makes a huge difference in overall loudness to a close observer.
Vinson
It can be huge, but as long as is it is hearing safe (16" gun), then I am not sure that it really matters and if it isn't hearing safe (like on a 10.5 AR), then it REALLY doesn't matter as you will be wearing hearing protection any way.
From a training standpoint, the odds that everyone in a carbine class will be running a can is about zero. So you are will always be wearing ears. So again, 1-15db difference does not matter.
What does matter is being in that same carbine class, deciding to remove your can and shoot at 10" targets at over 200yds and still being able to hit the target.
C4
You cannot suppress the sound barrier jump. So you are always going to get a loud noise that is sometimes hearing safe and sometimes not (depending on barrel length).
Sure.Quote:
On the downrange side of the shot, an observer close to the path of the bullet will hear the supersonic crack but depending on their orientation to the round passing they might be unable to correctly guess the direction the shot was fired from.
Correct AND flash suppression. Splitting hairs ove a couple DB's though when POI shift is a more important issue is my point.Quote:
One of the main reasons for a suppressed weapon is to mask the origin of the shot to prevent detection and aid in follow up shots.
C4
I've noticed a big difference in zero shift when using different ammunition types as well.
With my AAC M4-2000, I get a 4:30 3" shift with XM-193 bullets, but with 75 and 77 gr bullets, the shift is reduced to 1"
The same can will give different POI shifts on different guns. My M4-1000 puts my POI 1" high at a hundred on one 14.5" barrel, and 4-5" low on another 14.5" barrel.
POI shift claims by companies should be about as valuable to you as their Db claims.... ;)
Correct. That is why I test all can's on the SAME barrel.
With SF cans, RARELY have I seen anything on over 1MOA on many different barrels. I have also compared notes with other C3 dealers and they report the same (in regards to SF cans having small POI shifts).
On the other hand, the smallest POI shift I have ever seen for a NON SF can is 1MOA, with the average being around 3-4MOA.
C4