Suppressing a 10.5” Grendel.

[Schleutj]

There are some older threads/posts, but I was hoping someone has been doing this for a while. I have almost finished my 10.5” Grendel and am trying to figure out which of my rifle cans I may sacrifice trying on it. I have an Omega, Hybrid, and a home brew. I think the home brew will be tried first. Anybody got any info?

[mtnlvr]

Anybody got any info...? On what specifically?

[Schleutj]

If you are running a can on a 10.5” what type is it and/or does anyone have any experience running a omega or hybrid on a 10.5”.
I called SiCo and they said the hybrid is rated down to 10” on Grendel. Heading out tonight, hopefully, to give it a run.

[Klem]

Sch,

I've got to ask...You still have to wear hearing protection so why suppress such a short barrel when it is only going to make it longer?

You've gone to the trouble of making a notoriously slow calibre even slower so obviously gun length is important to you. Why then lengthen it with a suppressor? If you are OK with a gun at the length a suppressor is going to make it you could fit a barrel the same length and enjoy the extra velocity - just saying.

[Oso Polaris]

I started out with 300BO and so I am always confused by the choice to build a SBR AR15 (<12") in Grendel. The whole design behind the Grendel was the additional case capacity to achieve higher velocity. There is an extra 10gr (50% case capacity) in Grendel over 300BO. Due to the different types of powders used, the increased capacity doesn't translate 1:1 into velocity. The 300BO is using pistol powder (higher energy) and can handle higher pressures (thicker bolt).

With the SBR Grendel are you planning to compensate by either:
1) Reducing your charge weight of current powder to avoid throwing 1/3- 1/2 the powder volume (unburnt) down your barrel into your suppressor/out the muzzle for a large fireball... big flash & boom.
2) Switching to a faster burning powder to increase your velocity... now you just have 1/3 empty case.

Since you are in the Pistol Length Gas. this is definitely one of those times that an Adj. Gas Block makes sense for a Grendel.

[SSK shooter]

I have an Omega that I use on a 12.5" Grendel. If I remember correctly SiCo rates the Omega on a 10.5" 223 barrel and 12.5" for most everything else. I haven't played with my set up in a while. I know I am over gased so it wasn't the quietest. It was definitly quieter than unsuppressed. Accuracy was about 1 moa with Hornady 129 sst at 100 yds.

[tibis3383]

Honestly, both Sico cans you are talking about suppress the 6.5 G beautifully. I wouldn't even change endcaps in order to reduce back pressure which will keep port pop down and the gas out of your face.

In terms of wear and tear, it will largely depend on how hot you are getting the can.

6.5G is one of my favorite calibers to suppress and from my experience will be outdoor hearing safe for hunting even being on a 10.5" barrel.

[Klem]

and from my experience will be outdoor hearing safe for hunting even being on a 10.5" barrel.

Don't kid yourself because you went to a lot of effort and cost. No suppressed high-power centrefire is 'hearing safe'. The best you can hope for is a 35db reduction and it makes no difference to the N-wave. Typical occ health and safety thresholds for hearing safe in an industrial environment is 80 - 85db. One or two shots here and there - it doesn't matter as hearing damage is cumulative. It will creep up on you.

[myrifle]

Don't kid yourself because you went to a lot of effort and cost. No suppressed high-power centrefire is 'hearing safe'. The best you can hope for is a 35db reduction and it makes no difference to the N-wave. Typical occ health and safety thresholds for hearing safe in an industrial environment is 80 - 85db. One or two shots here and there - it doesn't matter as hearing damage is cumulative. It will creep up on you.

Yea ibhad to still wear ear pro when I tryed a couple of cans on 16 and 20 inch grendels both ar and bolt action.

And I'm deft in my left ear and cant hardly hear out the right ear.

Couldnt see where it was hearing safe, even outside in the wide open.

[Nodak]

I use my 12" Grendel with a can. It's not sub quite but it's very effective in a hunting scenario. Not safe but 10,000 times better than without.

[keystone183]

Sch,

I've got to ask...You still have to wear hearing protection so why suppress such a short barrel when it is only going to make it longer?

You've gone to the trouble of making a notoriously slow calibre even slower so obviously gun length is important to you. Why then lengthen it with a suppressor? If you are OK with a gun at the length a suppressor is going to make it you could fit a barrel the same length and enjoy the extra velocity - just saying.

I'm not the OP, but i'll take a stab at this..... You're not looking at it from the right perspective. I have decided i want a 6.5 grendel. I will not shoot an suppressed rifle. I want it to be under x length. Thus, i need a 10.5" barrel.

[LRRPF52]

My 10.5” will be suppressed. Just not sure what can to go with yet.

[LRRPF52]

I’m debating on what flash can or linear comp to go with on the 10.5” while waiting for a can.

These look good:

[peak98]

Kaw Valley Precious linear comp works well, I’m happy with mine.
peak98

I’m debating on what flash can or linear comp to go with on the 10.5” while waiting for a can.

These look good:

[Growler]

A linear comp with electronic ear pro may be the best of both worlds. For me, with nearly daily APU hearing damage, I’m inclined to go with the best protection available. Honeywell sucks!

[RetroJunkie98]

Well I can speak to my reasoning for building one, so hear me out.

I was deer hunting with my fathers R700 in 30-06. My buddy Ian is sitting back to back with me in a 8ft octagon blind we built 30 foot up in the air.

We sit there most of the morning seeing a doe here or spike there. He taps me on the shoulder close to 10am and I turn to see one the cleanest 8pt bucks I’ve ever seen, trotting out in the open. I hushed Ian, threw the gun up, and let loose within a split second.

I saw the shockwave off the bullet fly the 70 or so yards and saw flesh ripple on impact. Ian and I were screaming at each other immediately after, saying we couldn’t hear each other.

So from that moment on, I had a goal. A semi-auto powerful enough to kill a deer to 300 yards, lighter than a R700, no longer in length, and quiet enough to not go complete deaf shooting it unprotected once a year.

So I built a 12.5” Grendel into a pistol, stuck a sandman TI on the end, and had a short 7 pound boomstick with more than enough ft•lb of energy to drop a whitetail. The 129 ABLR gave me expansion to 700 some yards, and more than 1800 fps out to 200+ yards.

Contrary to popular believe, the 130s don’t lose much speed out of a short barrel. And with the absolutely bonkers BC’s they put up, your 4” point blank range lasts out to about 175 yards near sea level.