Suppressors 223 can. Polonium versus OCM5 versus 338 ultra?

According to Andrew, the full-size Polo and OCM5 are neck-and-neck, just one is OTB and the other is not.

I would think the gigantic .338 Ultra would be the quietest, but that big .338 bore with a .224 bullet might be a hindrance that negates any advantage with all that volume.

I'd be interested to see a full-size Polo vs. a .338 Ultra side-by-side test just out of curiosity.

If I had to say this, if you want quieter than all of the above, just get a Hydrogen-S 6.5mm or a Hydrogen-L 6.5mm can. The Hydro-S 6.5mm is stupid quiet on anything short-action or AR15 sized cartridges, and on 6.5mm or smaller bores. My Hydro-S 6.5mm on my 20" .25 Creedmoor shocks folks at the range that a 7" can is quieting it down that much.
 
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I know the first time I was around a Polonium me and several others in our squad were impressed. The guy was shooting a 6 creed and it was really quite and I have a TBAC Ultra 9. The second time I’ve heard one was on a full auto AR and it still was impressive.
 
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I've read many times where Andrew said the OCM5 is quieter than the polonium in the numbers but they sound close to the ear. I have 2 OCM5s and a 338 ultra I've shot on 223 bolt guns and I'd say the 338 is quieter but not by a lot.

I tested my Magnus and my 338 ultra on a 223 bolt gun and the Magnus was quieter to the ear for me and my gf standing a few yards away.
 
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338 ultra is stuuiipd quiet with 223 bolt gun. No idea on a gasser... However do you really want a footlong can on there
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An OTB 338 ultra looks pretty ridiculous on a 16.5" barrel for sure.
 
I'd bet the 338 ultra is about the quietest on most guns due to sheer volume. I've run the 338 side by side with a magnus on nearly identical 6mm dasher and the magnus was a shade better, I think simply due to the smaller bore. The magnus and 338 are near identical in size when next to each other.
 
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