9mm

[Snuby642]

I don't follow.

It (under atmosphereic conditions) cracks or doesn't crack.

When the projectile hits the threshold it cracks, nothing going on in the barrel or suppressor matters at all.

If you could throw it fast enough with your hand it would crack.
I can't figure bleed off systems doing shit that adding less powder in a standard barrel would do.

It's marketing bull shit.

 

[Ape_Factory]

I don't follow.

It (under atmosphereic conditions) cracks or doesn't crack.

When the projectile hits the threshold it cracks, nothing going on in the barrel or suppressor matters at all.

If you could throw it fast enough with your hand it would crack.
I can't figure bleed off systems doing shit that adding less powder in a standard barrel would do.

It's marketing bull shit.

It isn't. H&K has been doing it for a long time with their MP5 SD. The ports, just after the chamber, bleed off enough energy to reduce the bullets to subsonic speed. It's not a gimmick, it's physics.

 

[Snuby642]

Oh wait for it, (preemptive) fanboy alert.

 

[Snuby642]

Why not run a barrel that's not a fucked up marketing toy and subs like a normal person in the first place.

 

[JR1200W3]

It's for people who don't reload or get to choose their ammo. Originally for euro miliary that just shot 124gr ball.

The BRT CAR15 is supposed to be really quiet. It just leaves you in an odd space when you want to shoot 147's that you expect to expand. I've tested SIG V-crowns, 147gr XTP, 147gr Speer Gold Dots, and 147 HSTs at 1000-1030. The Gold Dots wouldn't fully expand until you got over 1050 which is supersonic at 8000ft in the wintertime. So, it sucks for a subsonic expanding bullet for me.

So, all those bullets are going to underperform at 850fps. If you want to shoot expanding 147gr subs in a bleed off, you have to add more powder which kind of kills the idea for me. If the idea is just the quietest 9mm period, it's pretty cool. I bought a lower, parts, and a suppressor adapter for his upper but have been putting off buying the SD upper because I have a bunch of competition barrels and bullets to buy.

 

[JR1200W3]

Why not run a barrel that's not a fucked up marketing toy and subs like a normal person in the first place.

The radial delayed SD with his hub adapter and a suppressor like a Vent 2 or MOB MIGHT be the quietest 9mm you can get outside of the Curtis Tactical 9mm bolt gun that never made it to market. Plus, it looks cool as shit.

 

[Snuby642]

Fanboy stupidity at its finest.

 

[Snuby642]

Originally for euro miliary that just shot 124gr ball.

Shows how stupid euro trash is.
Spec out a whole new system instead of deleting a few grains of powder.

I didn't hear any difference than shooting subs through a compatible can, \ same can.

That video sounded like a child narrated it strait from some video game.

 

[Snuby642]

It's not a gimmick, it's physics.
I get that it works.

There is just no added value to standard subs in a regular barrel.

Kind of like adding a bunch of proprietary adjustable parts from one end of an ar to the other and ending up at the help desk on the forum because it all sucks and you can't keep it running.

Classic fan boy shit nothing personal. Ever notice that the pleas for help always start off with the same few fan boy companies parts. LMAO

 

[45-90]

Anyone ever do a SUPERSONIC 147 grain load? I'd like to develop something for a 5 inch "SD" integrally suppressed barrel. It's designed to bleed off enough speed to make 124 grain NATO rounds subsonic and I'd like to do that for 147 grain.

I've not seen any load data but see that Federal and Underwood both make a +P supersonic 147 grain round. Will be used in a PCC with roller delay and obviously suppressed.

So far I've looked at data from Hodgson, Alliant and VV's site and not seeing anything suitable but need to rummage through a few other reloading manuals. But looking for advice on powder choices which are relatively clean-burning so I'm not cleaning the SD adapter every 300 rounds. I have a bunch of VV N330 and Alliant Sport Pistol, and normal small pistol primers.

Easily doable in a 10"... I have not tried it in a 5 inch but the 147s will do over 1300 in a 10.5 in AR 15 pistol.
124s 1600 fps
115s 1720 fps
Also ran some 155 gr fmj at 1200 fps in the 16"
I run 9 mm in barrels up to 16" and its still gaining velocity.
Bullets from 50 gr copper at 2640 fps to 185 gr cut down from 200 gr & resized .358 rifle bullets to .355 dia,
The thick rifle bullet jacket acted like a FMJ so it was not very useful to me.
If you're gonna go heavy try Shell Shok 9 mm 2 piece cases, a bit more capacity to try to get 147 gr to 1200 fps in 5" barrel.
Blue Dot plus P is a good powder for the heavy bullets velocity endevor.

 

[45-90]

This load was fired on a 10.5" AR 15.
It's a definitely a plus P load and not for use in any other type of firearm, as I have not shot it in any other.
1300 fps with a 147 HST....observe the cartridge overall length ... a small change in COAL can be disastrous in the tiny 9 mm case, as pressures rise ridiculously fast with just a slight change in seating depth.

I would definately Not fire it in my Glock 9 mm pistol.
If you use it, work up and see if it's right for your AR type weapon only.

Use at your own risk.

 

[Ape_Factory]

It's not a gimmick, it's physics.
I get that it works.

There is just no added value to standard subs in a regular barrel.

Kind of like adding a bunch of proprietary adjustable parts from one end of an ar to the other and ending up at the help desk on the forum because it all sucks and you can't keep it running.

Classic fan boy shit nothing personal. Ever notice that the pleas for help always start off with the same few fan boy companies parts. LMAO

You didn't even realize there was factory supersonic 147 grain 9mm ammo available. We all get that you don't get it. If you don't have anything helpful then stop being a troll and let the adults continue the conversation because your opinion doesn't mean jack shit. Nothing personal.

 

[Ape_Factory]

This load was fired on a 10.5" AR 15.
It's a definitely a plus P load and not for use in any other type of firearm, as I have not shot it in any other.
1300 fps with a 147 HST....observe the cartridge overall length ... a small change in COAL can be disastrous in the tiny 9 mm case, as pressures rise ridiculously fast with just a slight change in seating depth.

I would definately Not fire it in my Glock 9 mm pistol.
If you use it, work up and see if it's right for your AR type weapon only.

Use at your own risk.

Will obviously require some testing but I think if I can get it to the 1100fps range, I'll be about 950 out the muzzle. I may just order a box of the Federal and test that out first.

 

[Snuby642]

Not pursuing 9mm pcc supers to force them to run subsonic doesn't disqualify me from anything.

Hell why don't you spin up some 24 inch uppers and get subs to go sonic while your at it .

Then get spin doctors and fan boys to pump it up.

Fair warning the 24 inch uppers won't be as easy to stick up your ass as the faggotry you are pushing now.

 

[JR1200W3]

I think my approach would be, or likely will be if I ever get around to buying his upper, is to use the RMR 124gr MPR Nukes and load them to normal supersonic speed with a pretty small charge of Tight group. Something like 1100fps. Shooting them through the BRT upper should put them at subsonic. Then I could still use the ammo in a pistol for self defense at typical supersonic 124gr levels. I'm guessing the charge of Tight group would be around 3.2-3.8 gr so it will burn quickly instead of continuing to burn towards the end of the suppressor. The Nukes expand very easily. More so than most of the bullets I've tested. They're designed and made that way and make a great 9mm bullet for compact short barrel pistols like G43X's where the mv is going to be slower.

 

[Ape_Factory]

That isn't a bad idea JR. Definitely food for thought.

Went to the range on Saturday and ran by Academy for a big box of target 9mm. Found Winchester Defender or Defense 149 grain and if I remember correctly had the velocity at around 1150 on the back of the box. I just searched Winchester's site and don't see it but I bought the box and will snap a photo when I get home. I should have chrono'd it out of my 5" Beretta just to see what sort of velocities it'd produce.