I have not shot an SD side-by-side my muzzle-suppressed (Trident) gun. (I know this isn't relevant to the discussion, but I though I would throw that out there as another suppressed platform not as practical as 9mm due to cost and the "exotic" factor, but it's more data for you, nonetheless) 338 Spectre, and I'll be able to get more range and accuracy out of it than with the MP5, and be able to bring down some larger targets. 338 Spectre AR, because I've got the 9mm bases covered now (MP5, P7, and Sig 226). The 115gr ammo was Federal Champion (really cheap at wal-mart). Could have been the ammo- but the 147gr ammo wasn't super-duper-special or anything, it was just Federal American Eagle truncated-cone flat point. it just wouldn't, no matter how hard I tried. The 115gr wouldn't do that with the suppressor. Last weekend I was shooting sub-inch groups with my MP5 clone and Trident at 25 yards with 147gr ammo (with the help of an Aimpoint T-1 red-dot sight). They drop more over a distance than lighter projectiles, of course, but with the range of the MP5 and the 9mm round, this is not a big deal. Although that is just one data point for you to consider, the heavier projectiles are more resistant to wind when moving downrange, for example. If you are interested in penetration (which is a good metric for measuring terminal ballistic performance) 147gr full power loads (still subsonic) are, as they say, "mo-bettah."Īlso, I find 147gr projectiles more accurate with suppressed use with my MP5 clone and Trident, than 115gr projectiles. you get a lot more momentum from a 147gr full power load than a 115gr load neutered by the barrel-porting on the SD. What I was alluding to was the terminal performance i.e. You are correct, the bullet mass is not going to make a difference in how the report sounds, unless it changes the speed of the projectile. Think of it as a hybrid.Ĭlick to expand.Well, you mentioned two variables, but I assumed you were talking about overall performance, not just dB level (sound suppression). The SD has a very specific role to play, while adding a suppressor to a standard MP5 is an adaptation to fill in for that role. I think the issue of balance is why factory SD cages are so thin. For many of the light weight aluminum suppressors out there, that's not too great an issue. One must also consider the slight increase in overall length of the MP5N with a suppressor as well as the effect of the balance to the gun. The standard MP5 barrel is close to 9" and some "subsonic" rounds will achieve supersonic speed through the MP5 barrel. One must also consider that rounds promoted as "subsonic" are often rated for something like a 4" handgun barrel. The can attached to a standard MP5 will generally require a subsonic load (usually with a heavier bullet of 147 grains). For both guns, the velocity must be below supersonic to avoid the "crack." The SD does this by slowing down most available rounds (generally designed around the 124 grain NATO round).
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