147gr Speer Lawman Supersonic from CZ75 Suppressed

lordfarquaad · Jul 19, 2021

So I've had some Speer Lawman 147gr for a couple of years now and went out in the field on my property to try it out with a CZ75 4-1/2" barrel suppressed. I was pretty surprised to still here the crack echoing. I don't have a chrono so wanted to ask, does this surprise anyone or would it be considered common to have 147gr ammo still wavering between sub- and super-sonic on an 80 degree summer day?

Englishmn · Jul 19, 2021

Definitely possible as they spec that ammo at 985fps from a 4in barrel.

GaryNC · Jul 19, 2021

My 147 Gr Federal is listed as 1,000 FPS and was hoping that it would be subsonic with my AR-9 when the suppressors gets out of ATF jail. Starting to sound like I will need to find or load something else to get rid of the super sonic crack.

lordfarquaad · Jul 19, 2021

Yeah if it is going super out of my 4.5 inch I am guessing your AR-9 will have a nice crack to it

MachIVshooter · Jul 19, 2021

I've never had issues with Lawman 147 going super from pistols, and the sound barrier is a little lower here at 6,700 ft, about 1,090 FPS.

Englishmn · Jul 19, 2021

Pull one and weight the bullet, might be a 124gr.
The factory 147 I have shot in my tavor have been subsonic.

greyling22 · Jul 22, 2021

FWIW, my 125 grn lead reloads that do 1025 in my 8" ar banshee do about 930 in my 4.5" witness. Using WSF powder. They struggle to cycle the suppressed p07, even after I cut a coil or 2 off the recoil spring.

JDGray · Aug 30, 2021

With "supersonic" on the ammo box, I guess I am not surprised...

147gr Speer Lawman Supersonic from CZ75 Suppressed

lordfarquaad

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Englishmn

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GaryNC

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lordfarquaad

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MachIVshooter

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Englishmn

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greyling22

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