No, I really would have no use for something like that, and to tell the truth, that kind of performance (phone books and 2x4's) doesn't sound all that far off from a .22.
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Interesting.
I always like to see people experiment a little and show their results. :cool:
Grant was correct in his original post and statement. The rounds he shot were 150grain subsonic bullets for the 5.56.
Just because you may not have knowledge of everything dont assume that they dont work or exsist.
From what I've seen subsonic 5.56 / .223 just doesn't have enough power at a distance.
There are hearing safe cans for 5.56 when shot dry; what's the point of the subsonic load for one? Not to mention hand cycling an AR just plain sucks.
OK, I give in. I suppose there is a use for this. If I were a silent assassin, or hitman, and needed to deliver relatively close, very quiet, and fairly low power hits from a manually operated action rifle, then I guess, yes, there is a use. But, that is just not what I own AR's for. I think there are much better platforms and calibers available to accomplish that, for somebody that might have that need. Neat idea, and have fun tinkering with it, but its just not my style.
To give perspective as to why some might find an ultra-quiet subsonic round appealing...
I used an issued KAC suppressor on my M4 while in Iraq. Often times we used supressed fire from M4s to kill dogs/animals around the perimeter before a night time raid. Obviously a sub-sonic round is far quieter than M855 and Mk262. This means it would be much less likely to alert the occupants of a dwelling that we're capping their dogs and preparing to assault said dwelling.
I would bet money that sentry elimination is the #1 reason why the aforementioned "tier one" unit wanted these ultra-quiet subsonic rounds.