DDM4 V7P .300 blackout advice

[Hill Hunter]

Hello all, new to the forum & in Wisconsin. I’m an avid hunter & familiar with AR platforms through work, but not a lot of research into my personally owned firearms/modifications and builds....until recently....

I just ordered a DDM4 V7P in .300 blackout and have an Elite Iron STFU on the way! I watched some accuracy testing videos online after making those purchases and while the videos shown didn’t test many different types of ammo, I’m wondering if an adjustable gas block is needed to achieve acceptable accuracy with this gun. I know it doesn’t come standard with an adjustable gas block....

Thoughts....

 

[GH41]

What makes you think an adjustable gas block will have any effect on accuracy?

 

[Hill Hunter]

Just a thought, being my friend claimed to have adjusted his for better accuracy on a .300 blackout he built.

Nothing to support otherwise, which was why I was asking...and it made me wonder after watching mrgunsandgear test the DD on paper at 100 yards...

 

[NighthawkCG]

Doesn't make sense to me. I'd get it and test it before finding not good solutions for problems that may or may not exist.

Does your friend have a recoil management or anticipation problem?

 

[iktomi]

Hill Hunter,

I think most of the Elite Iron suppressors run with a relatively low back pressure (I don't know the performance of the STFU specifically), so you may be able to get away without an adjustable gas block and have a reasonably gassed platform.

If you find that the gun is running a little hard (overgassed) while suppressed, an adjustable gas block can restrict some of that flow and reduce the amount of energy being transferred into the reciprocation of the action.

Reducing the energy in the reciprocation of the action may shave down movement of the gun during recoil. This can improve recovery time to follow up shots.

Generally speaking, restricting your gas will have more of an influence on recoil management / follow ups than improving group size.

Pistol builds are awesome for the reasons they are awesome. They have inherent characteristics that make them challenging to group. With 300s being 'optimized' around shorter barrels, this may be less pronounced than a full pressure 556 load shot from a (SB4) braced pistol.

 

[Hill Hunter]

Doesn't make sense to me. I'd get it and test it before finding not good solutions for problems that may or may not exist.

Does your friend have a recoil management or anticipation problem?

Sounds good, hoping for the best. Gonna start with a 190 gr Hornady sub x

 

[Hill Hunter]

Hill Hunter,

I think most of the Elite Iron suppressors run with a relatively low back pressure (I don't know the performance of the STFU specifically), so you may be able to get away without an adjustable gas block and have a reasonably gassed platform.

If you find that the gun is running a little hard (overgassed) while suppressed, an adjustable gas block can restrict some of that flow and reduce the amount of energy being transferred into the reciprocation of the action.

Reducing the energy in the reciprocation of the action may shave down movement of the gun during recoil. This can improve recovery time to follow up shots.

Generally speaking, restricting your gas will have more of an influence on recoil management / follow ups than improving group size.

Pistol builds are awesome for the reasons they are awesome. They have inherent characteristics that make them challenging to group. With 300s being 'optimized' around shorter barrels, this may be less pronounced than a full pressure 556 load shot from a (SB4) braced pistol.

Thanks for the responses and knowledge! I will post results...I don’t believe my buddy has either of the other problems mentioned & gets, in my opinion, acceptable accuracy.

I bought this gun/surpressor for a cpl reasons. One to get my kid hunting earlier than she can handle loud noise/recoil, home defense and my own doe culling in the later hunting seasons. I’d be happy with 1 1/2” groupings at 100yds...

Anyone with Experience shooting the 190 grain Hornady sub x bullets? Or have another recommendation? I have the Hornady loads, looking for some Lehigh defense 194 ME

 

[NighthawkCG]

Subs can be a bit difficult at distances sometimes, but you should be able to do 1.5" at 100.

I like the choice of you mention, but have not shot them and mainly stick with easier to find stuff. If you can find them, the barnes 110gr black tips shoot great in all platforms. Speaking about easier to find - best of luck finding some ammo now. Around here, 300 BO was the first go off the shelves surprisingly...

 

[loveha]

Thanks for the responses and knowledge! I will post results...I don’t believe my buddy has either of the other problems mentioned & gets, in my opinion, acceptable accuracy.

I bought this gun/surpressor for a cpl reasons. One to get my kid hunting earlier than she can handle loud noise/recoil, home defense and my own doe culling in the later hunting seasons. I’d be happy with 1 1/2” groupings at 100yds...

Anyone with Experience shooting the 190 grain Hornady sub x bullets? Or have another recommendation? I have the Hornady loads, looking for some Lehigh defense 194 ME

Shot the Sub X and the 194 ME, also tried some Maker rounds of similar style to the Lehighs. Barrel was a 12.5" Proof Carbon with Sandman Ti. I get about 1 to 1.25 MOA with the Sub X, but the other two, never again. Lehighs keyholed, unstable as shit. Some of them I could see traveling to the target 50 yards away doing weird shit. I want to say I had the 190gr Maker Rex, those just did terrible for groups. Back when the rush on ammo started, I bought a few more boxes to last me for the next couple years for hunting purposes.

The Sub X, they work, and work good. Killed this guy with the Sub X at 90 yards. Maybe went 30 yards and ate snow. Could not find the bullet unfortunately.

 

[sparky702]

The 190 sub-x is defiantly a killer . I took a high shoulder shot on a doe at 60 yds and dropped her right where she stood . It punched through the shoulder took out the spine and made a huge exit hole through the other shoulder . I was using a mini-14 300 blackout and a yhm phantom suppressor . they wont cycle my mini or my S&W 16 inch blackout with out the can , but I also have an 8.5 inch cmmg blackout that will run them with out the can .