Eley Contact going supersonic with suppressor

[edwardmatt83]

I have been having good results with Eley Contact until the weather warmed up. I'm shooting it with a CZ 457 16" barrel and sparrow22 suppressor.

I tried an experiment the other day shooting with and without the suppressor. Groups at 50 yards opened up and it was definitely loud with the suppressor on.

Take the suppressor off and it quiets down and I'm getting much smaller groups.

I guess that explains my recent match troubles since the weather has gotten warmer. Combo of warm temps and suppressor has just pushed it over the sound barrier. I was not having these issues in the winter.

Just something to be aware of. I guess I'll be shooting without a suppressor until it cools down.

 

[alamo5000]

The sound barrier moves. The speed of sound is X at 45 degrees and Y at 85 degrees.

There are about 20 other things to consider in your equation but to each his own. I wouldn't take your ultimate conclusion as being correct though.

 

[edwardmatt83]

The sound barrier moves. The speed of sound is X at 45 degrees and Y at 85 degrees.

There are about 20 other things to consider in your equation but to each his own. I wouldn't take your ultimate conclusion as being correct though.

If I shoot at the same temp with and without the suppressor and I can hear a crack with the suppressor and not without the suppressor, the suppressor must be causing a velocity increase right?

 

[W54/XM-388]

You might consider spending the money on a really good chrono such as the magnetospeed or the LabRadar and verify exactly what speed your ammo is going at and what your ES is for the lot.

 

[alamo5000]

If I shoot at the same temp with and without the suppressor and I can hear a crack with the suppressor and not without the suppressor, the suppressor must be causing a velocity increase right?

No. But you can put it on a chronograph and prove to yourself that velocity isn't changing much if at all with/without the can.

The muzzle blast of just about anything that I know of is substantially louder than the sonic crack of the bullet.

The muzzle blast on a 223 is something around 160-170 but the sonic crack of a bullet is around 140 ish.

Basically the muzzle blast will mask other down range sounds. A 165+ db blast going off a few inches from your face is going to cover up a 140+ db bullet signature going down range.

 

[alamo5000]

I don't recall seeing a suppressor in use at the recent NRL22 championship.

I would have to ask the relevance of that to what the OP posted?

I'm pretty sure there is a lot more going on among top level shooters to justify either way.

So far here though no one has tried to argue one way or another as far as competition goes. The reasoning of the original post however is a bit off in my opinion.

 

[Gleedus]

The additional velocity has nothing to do with group size. High velocity vs standard velocity doesnt apply like many people think. I expect the harmonic change of adding the suppressor is the main culprit.

 

[edwardmatt83]

Have you seen suppressor effect harmonics with one ammo and not another? SK standard plus has no issues for me with and without the suppressor.