30 cal question

[duey1267]

Which 30 cal can would be the best for use on both a 308 bolt gun and a 300 whisper AR?

[k31user]

I recently had the pleasure of shooting some rounds through a 9" AAC Blackout upper/SDN-6 suppressor combo here at the shop. It's the first AAC i have ever been around and with sub sonic ammo(220 gr Rem) it was outstanding. I had an 8" upper here and a shortened 3rd model(2" shorter on the back end) so I ran them both over the meter. The SDN-6 kicked butt so bad it hurt. FRP was 129 followed by 126,126,126,126.5. The modified 3rd model was FRP 140 followed by 138,136, 134.5,134.5,134.5. Ours was a brand new suppressor and these were the first rounds fired through it(not making an excuse). I was going to stop but decided to shoot some 125 gr supersonic instead. The SDN-6 had a FRP of 140.5 followed by 138, 137, 136, 136.5, 137, 136.6, 137. I hesitated even trying the short 3rd model but decided to go ahead. FRP of 139 followed by 137.5, 136.5, 135.5, 135.5, 136, 135, 134. So basicly about the same as it did with sub sonic ammo. For giggles I put the short 3rd on a 18.5" .308(Savage bolt gun) and got a FRP of just under 140(139.8 or so) followed by 137.5, 136, 136.5, 136.
For sub sonic only, the SDN-6 shines. It doesn't do as well on supersonic(I didn't have a way of testing with .308 so you may need to go to the silencer forum site for data). The short 3rd model is probably around 1-2db louder than a full length 3rd model but was all i had that would fit. A 12th model would probably be about 1db quieter than the short 3rd model. The 3rd model sticks out about the 1" longer in front of the muzzle than the SDN-6. Don't know how much difference(if any the difference in barrel length made).
Sorry for the rambling, it's early.

RonA

[doubloon]

For what application?

Hunting at 50-200 yards?

Long range bullet stacking at 600+ yards?

Mag dumps at Knob Creek?

Impress chicks?

[duey1267]

Primarily long range steel but possibly some hunting...

[doubloon]

I made my choice based on long range paper/steel and hunting.

I'm not going to be doing any mag dumps, I'm not going to be rapidly jumping it from host to host, I'm not going to be doing any tacti-cool stuff like shooting suppressed, jumping and rolling in bushes then quickly going unsuppressed, suppressed and unsuppressed again. And impressing chicks would just mean fighting lawyers for the guns and the dogs.

So. I decided I don't need QD and I don't much need non-can flash suppression and I went a Liberty Freedom because titanium is expensive.

I decided on the Freedom mainly because of the independent tests I've seen/read around the interwebs. Someone should be along shortly to tell me what a boneheaded decision I made.

[Bendersquint]

Someone should be along shortly to tell me what a boneheaded decision I made.

Not a bonehead decision at all, from what i have heard its an outstanding performer!

[duey1267]

I know that I want to go with one of the OPSinc cans due to some Info that came from a few coworkers. I'm just not sure which one to order.

[doubloon]

Thanks for the support -B-.

I don't know much about ops inc cans, I don't think they've made the top 10 on any lists I've looked at.

I didn't know you were starting with a bias.

You should be whatever makes you happy, that's what I did.

[k31user]

[quote="duey1267"]I know that I want to go with one of the OPSinc cans due to some Info that came from a few coworkers. I'm just not sure which one to order.[/quote]

Either a 12th model .30 cal or a 3rd model .30 cal will work well. I prefer 3rd models personally. I think either of ours will compare favorably to the Liberty suppressor. They are heavier, but are all stainless, less than 8" in front of the muzzle and similar sound suppression levels.12th model requires at least 2.75 inches of barrel in front of the gas block, 3rd model requires 4.75".

[nukemmc]

I am running a 3rd Model that shares time between a 300WM with a barrel profiled for it and a 308 with a Varmint barrel that has been shortened to 22" and a collar interference fit to the barrel to accept the 3rd. I am looking at doing a GAP-10 in 260 and will have it threaded and collared to accept the 3rd model. The 3rd model has been an outstanding choice for me. I enjoy shooting what is essentially a MK13 Mod0 300WM with 208s running 2975fps with no earplugs necessary, 308-ish recoil and 1/2moa accuracy.

Ron - Isn't alot of the noise attenuation in the Ops Inc cans due to the timing of the reflected noise in that back portion of the can? What would happen if you shortened the 3rd model by 2" on the front?

[k31user]

[quote="nukemmc"]I am running a 3rd Model that shares time between a 300WM with a barrel profiled for it and a 308 with a Varmint barrel that has been shortened to 22" and a collar interference fit to the barrel to accept the 3rd. I am looking at doing a GAP-10 in 260 and will have it threaded and collared to accept the 3rd model. The 3rd model has been an outstanding choice for me. I enjoy shooting what is essentially a MK13 Mod0 300WM with 208s running 2975fps with no earplugs necessary, 308-ish recoil and 1/2moa accuracy.

Ron - Isn't alot of the noise attenuation in the Ops Inc cans due to the timing of the reflected noise in that back portion of the can? What would happen if you shortened the 3rd model by 2" on the front?[/quote]

2" off the front would increase the sound quite a bit.

RonA