Suppressors Caliber compatability

[Swift]

Just placed an order for my first suppressor for a 308 bolt gun. It's the YHM 762 qd version. I've been procuring parts for a 260 build and a barrel is next on the list. Before I order though, I wanted to clear something up. The 762 qd is advertised as being compatible with 308 and 5.56. Does this mean it will work for any calibers in between? I've never seen dedicated caliber cans for rifles other than 308, 5.56, and 22, but I would prefer to avoid baffle strikes and damage resulting from the wrong load. So should I order a threaded muzzle or is that a bad idea?

 

[Force_Multiplier]

Re: Caliber compatability

it will work for the 260, just order an extra 762 QD flash hider

 

[Swift]

Re: Caliber compatability

Excellent. How do the physics work, though? Does it just spin freebore through the can? Is there any chance for baffle strikes with the 260 or the 5.56?

Also, unrelated, but where do you guys buy your subsonic ammo? Can't find anything for less than $40/box and that seems a bit steep. Only been reloading for about a year and I'm not comfortable enough reloading subsonic yet.

 

[HPLLC]

Re: Caliber compatability

More baffle clearance generally makes a suppressor less likely to have issues.

I've talked to manufacturers with more aggressive baffle systems who have opened bore diameters in order to eliminate accuracy issues associated with their baffle system. That seems to suggest that the more open the bore, the less effect it will have on ballistics.

The KAC M4-QD may have been a similar evolution- the original cans had .290" bores. The NT-4 cans were built for a contract requiring less POI shift and have .300" bores.

I don't know if that was when or why that change happened but it would seem like a potentially grounded concept. The NT-4 mount tolerances were tightened up from what I saw, so that would imply less need for a larger bore tolerance, not more.

The larger bore certainly doesn't help sound performance.

 

[Force_Multiplier]

Re: Caliber compatability

even a 30cal in your 762 can spins freely.... your bullet never touches the baffles, all the can does is give the gases a place to slow down and cool...


and most people I know roll their own subs

 

[hondakilla98]

Re: Caliber compatability

I'm also fairly new to reloading. How is it more dangerous to reduce the powder charge than to load to normal specs? Wouldn't that be safer? its not like you have to worry about it cycling like you would with a semi auto.

 

[wakajawaka]

Re: Caliber compatability

Not to hijack this thread but reduded powder loading can get complicated...

Some of the many variables to consider for a load safe for you, your firearm, and your can.

Powder burning rate, primer type, case loading density, bullet weight and type. Is your firearms twist rate suitable for your reduced loads? Can it stabalize your bullet of choice at slower velocity?

Maybe not the best jumping off place if you'r just getting started in reloading.

 

[RollingThunder51]

Re: Caliber compatability

Short answer, your bullet will travel though anything with a larger bore.

Long answer, no, a .260 through a .30 can will not do a particularly good job at suppression. There is already quite a bit written on this subject. The idea that additional volume makes up for over bore is a web myth, perpetuated mostly by those that may not have ever lived with caliber specific cans long enough to understand the difference. Nobody, that wants great suppression, thinks firing a .223 through a .30 sounds anywhere near as good as the dedicated .223 can. I shoot a lot of .260, in all its variants, you want no more than a 6.8 can to begin to perform anywhere near top spec. In short, you cannot strip gas off from behind a under-bore high velocity round, like the .260, effectively in a .30 can. Good, yes...great, no.

P.S. the tightest can bore in the industry has less than a 1% return due to baffle strikes caused by concentrically. Look to the threading work, look to the shoulder work, don't waste your time worrying about bore diameters. If the thread or shoulder work is off, well no suppressor is safe. Quick Detach REQUIRES big bore, usually in the form of graduated or "trumpet" bore. Why? because QD inherently has tolerance issues not present in single point. Nothing wrong with it, you get what you pay for, QD is a fast way to mount and dismount, it has consequences that must be accounted for in the bore. That is just the way it is.

You never told us what your host(s) is/are. Bolt gun for the .30, got that.

 

[kujo929]

Re: Caliber compatability

Do these multi caliber suppressors reduce enough that ear protection is not needed. For example if useing the 7.62 can on a 5.56 would it be loud enough that you need ear pro?

 

[mtrmn]

Re: Caliber compatability

I run my YHM QD titanium 7.62 Phantom on my 556 AR's all the time. I have no 556 suppressor to compare it with, nor do I have any sound testing equipment other than my own ears. TO ME, the 556 is actually a tiny bit quieter than the 308 through my 30 cal suppressor when I'm shooting without hearing protection. In certain areas, you may need hearing protection and in others you may not. It depends on your surroundings and how much stuff there is to reflect the supersonic crack of the bullet back to you.

The actual exit hole dia on mine is .380.

ALL this is with normal full power ammo-I tried the subsonics and they're stupid quiet, but I have no practical use for them.

I stood 50 yds downrange behind a berm and was about 20 yds from the path of the bullet. I heard NO sound from the direction of the shooting bench when my buddy fired my 308 AR. Every bit of the noise I HEARD
came from the direction of the closest point in the bullet's path at the 50 yd line and seemed to be just as loud as firing the gun myself. Just like somebody standing at the 50 yd (15 yds from me) target and firing a regular un-suppressed 22lr.

I feel I made the right choice by getting the QD so I could switch over to my other ARs, therefore using one high dollar suppressor instead of several. The titanium is worth the extra money as well for weight savings and (I think) less POI shift between suppressed and un-suppressed.

I know everybody says the thread attached versions are "more accurate" and caliber specific would be "quieter" and I can't argue with that. But in reality I can't shoot well enough to notice the accuracy difference, and I can't afford enough of these toys to cover every caliber. The supersonic crack from 99.5% of my shooting hobby will negate the 1 or 2 decibel advantage I might get from having a caliber-specific suppressor.

I also tend to over-think and over-complicate things to the point I miss out on many of the finer things thinking I have to do it a certain way because somebody said so and he really knows these things.

 

[Swift]

Re: Caliber compatability

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: RollingThunder51</div><div class="ubbcode-body">Short answer, your bullet will travel though anything with a larger bore.

Long answer, no, a .260 through a .30 can will not do a particularly good job at suppression. There is already quite a bit written on this subject. The idea that additional volume makes up for over bore is a web myth, perpetuated mostly by those that may not have ever lived with caliber specific cans long enough to understand the difference. Nobody, that wants great suppression, thinks firing a .223 through a .30 sounds anywhere near as good as the dedicated .223 can. I shoot a lot of .260, in all its variants, you want no more than a 6.8 can to begin to perform anywhere near top spec. In short, you cannot strip gas off from behind a under-bore high velocity round, like the .260, effectively in a .30 can. Good, yes...great, no.

P.S. the tightest can bore in the industry has less than a 1% return due to baffle strikes caused by concentrically. Look to the threading work, look to the shoulder work, don't waste your time worrying about bore diameters. If the thread or shoulder work is off, well no suppressor is safe. Quick Detach REQUIRES big bore, usually in the form of graduated or "trumpet" bore. Why? because QD inherently has tolerance issues not present in single point. Nothing wrong with it, you get what you pay for, QD is a fast way to mount and dismount, it has consequences that must be accounted for in the bore. That is just the way it is.

You never told us what your host(s) is/are. Bolt gun for the .30, got that.
</div></div>

I understand that a 30 caliber can isn't ideal for a 6 or 6.5mm load, but I was asking more from a safety standpoint. It's primarily gonna be on a 308 but having options without another $400 in tax stamps is nice.

The host rifle is a Savage fcp-k in an XLR with PST glass. I haven't had the factory brake off yet but I'm going to bring it to my dealer and have them sure up the threading before they install the QD brake. As it sits, with Southwest match grade loads it holds right around the minute mark give or take depending on weather and shooter.

While I don't want it to become a crutch, I hope that it'll allow me to better practice the fundamnentals and tighten up groups with suppressed and unsupressed rifles.

 

[RollingThunder51]

Re: Caliber compatability

Fair enough...safety meaning hearing protection, right?

Plugs or muffs every time, even with the can. The reason is that no suppressed result is really safe except for .22lr and subsonics. Even a well suppressed .30 with HV rounds allow you less than 2 seconds of exposure within 24 hours. Just plug up and go at it. That brake is going to make non suppressed shooting much worse. Having grown up on 30-06 without a brake, I just don't get why folks brake the .308.

Overbore is definitely better than nothing!

 

[HPLLC]

Re: Caliber compatability

If you are using a bolt gun most good suppressors on 20" bolt guns will drop noise at the ear to 125-130DB.

So if you take the worse 130DB, the OSHA table seems to suggest that the exposure limit is about 112 seconds per day.

The peak noise in that +0 to -10DB ballpark is only .25-.5 seconds in duration, suggesting you could actually safely fire ~224 rounds of suppressed .308 using a 20" bolt gun without exceeding the Osha limit for the day.

Now jump over to an AR- where the at ear noise is over 140, and the OSHA table would say zero safe exposure I believe.

<span style="font-weight: bold">That of course doesn't take into account the combined weighting of the daytime activity noise and the shooting, and only accounts for the shooting. So if you work 4 hours in a 90DB environment, that reduces your OSHA exposure limitation to 67 seconds and 135 rounds, or if you work 8 hours at 90DB, you are limited to no shooting at all.

So the OSHA dosing is kind of obscure that way. </span>

 

[RollingThunder51]

Re: Caliber compatability

I wish it was true....

http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=9736

In short, about 2 seconds at 130 every 24

The long text on the difference between pulse and constant...

Slide it back, its pretty good reading...in short, 112db and beyond on pulse is ng.

http://books.google.com/books?id=lJAeQsv...p;q&f=false

 

[1979brj]

Re: Caliber compatability

tag

 

[PGG]

Re: Caliber compatability

I just shot my AWC steel Thundertrap made for a .338 LM on my .338-408 Snipe tac for the first time yesterday. I had called AWC to make sure they thought it would be ok. We were shocked by the level of suppression and recoil reduction. It felt like a .308 and while I did use earpro since it was under a steel roof at our club it sounded like we could have gone without. The load was a 300 grain Lapua moving at 3333 fps according to our chrono. I couldnt be happier with my AWC's I have gotten to shoot with so far. I have four more pending and a few more on order. I have also shot my .308's through it with much satisfaction. Thanks PG

 

[Smith44699]

Re: Caliber compatability

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mtrmn</div><div class="ubbcode-body">I run my YHM QD titanium 7.62 Phantom on my 556 AR's all the time. I have no 556 suppressor to compare it with, nor do I have any sound testing equipment other than my own ears. TO ME, the 556 is actually a tiny bit quieter than the 308 through my 30 cal suppressor when I'm shooting without hearing protection. In certain areas, you may need hearing protection and in others you may not. It depends on your surroundings and how much stuff there is to reflect the supersonic crack of the bullet back to you.

The actual exit hole dia on mine is .380.

ALL this is with normal full power ammo-I tried the subsonics and they're stupid quiet, but I have no practical use for them.

I stood 50 yds downrange behind a berm and was about 20 yds from the path of the bullet. I heard NO sound from the direction of the shooting bench when my buddy fired my 308 AR. Every bit of the noise I HEARD
came from the direction of the closest point in the bullet's path at the 50 yd line and seemed to be just as loud as firing the gun myself. Just like somebody standing at the 50 yd (15 yds from me) target and firing a regular un-suppressed 22lr.

I feel I made the right choice by getting the QD so I could switch over to my other ARs, therefore using one high dollar suppressor instead of several. The titanium is worth the extra money as well for weight savings and (I think) less POI shift between suppressed and un-suppressed.

I know everybody says the thread attached versions are "more accurate" and caliber specific would be "quieter" and I can't argue with that. But in reality I can't shoot well enough to notice the accuracy difference, and I can't afford enough of these toys to cover every caliber. The supersonic crack from 99.5% of my shooting hobby will negate the 1 or 2 decibel advantage I might get from having a caliber-specific suppressor.

I also tend to over-think and over-complicate things to the point I miss out on many of the finer things thinking I have to do it a certain way because somebody said so and he really knows these things. </div></div>


I almost can't tell the difference between my 7.62 YHM QD can and my 5.56 YHM QD can on my 16 inch AR. Somedays the 308 cans sounds better to me. It is just heavier on the end of my carbine.

 

[Swift]

Re: Caliber compatability

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: RollingThunder51</div><div class="ubbcode-body">Fair enough...safety meaning hearing protection, right?

Plugs or muffs every time, even with the can. The reason is that no suppressed result is really safe except for .22lr and subsonics. Even a well suppressed .30 with HV rounds allow you less than 2 seconds of exposure within 24 hours. Just plug up and go at it. That brake is going to make non suppressed shooting much worse. Having grown up on 30-06 without a brake, I just don't get why folks brake the .308.

Overbore is definitely better than nothing!
</div></div>

Well I was talking more in terms of baffle strikes with smaller calibers. This will spend a fair amount of time on a 260 with a 26" barrel and I'm concerned about the length. Just more time for things to go wrong or do I have it backwards?