Sufficient minimum muzzle diameter for Suppressors

[hseII]

I've been kicking around the idea of a lighter rifle with a stiffish ~20" 6mm- 7mm something or other for quite sometime.

7mm-08
6GT/BRA, etc.

Looking at Bartlein's contour page,

Contour Dimensions | Bartlein Barrels

www.bartleinbarrels.com

I can't help but think a #3 @ 20" would net something like a 0.730" muzzle Diameter?

Is this adequate diameter & rigidity for suppressors?, or should I go ahead & step to the #3B at this length?

Looking to do a handy multi purpose on an existing R700 in a Hunter McMillan.

100% of the time it will be shot suppressed, but I won't be entering matches with it.

Will there be a negative effect with the #3 over a #3B?

Thank You.

 

[Hondo64d]

I went with a 3b on my 20" .22GT, just to make sure there's enough shoulder for the suppressor to seat against. A 3 probably would have been fine but I wanted to be sure.

John

 

[hseII]

I went with a 3b on my 20" .22GT, just to make sure there's enough shoulder for the suppressor to seat against. A 3 probably would have been fine but I wanted to be sure.

John

What is your muzzle diameter?

 

[bill123]

Here's a guide:

GUNSMITHING SERVICES: Muzzle Threading AND Crowning service

The incredible surge in the popularity of suppressors makes a threaded muzzle almost standard equipment on today's precision rifle. LRI is well-equipped for this extremely popular upgrade. With our resources and experience, your device will attach trouble-free every time. Muzzle threads for...

www.longriflesinc.com

 

[Red22]

I have a Weatherby Backcountry Gen 1 and the barrel is a 24" no1 contour. It shoots very accurately there is a significant POI shift with a suppressor (even a very light one) but it holds up nicely. I'm sure shorter would be even stiffer.

 

[hseII]

I have a Weatherby Backcountry Gen 1 and the barrel is a 24" no1 contour. It shoots very accurately there is a significant POI shift with a suppressor (even a very light one) but it holds up nicely. I'm sure shorter would be even stiffer.

Do you know what the muzzle diameter is?

 

[Red22]

Thread pitch is 1/2-28 od of the barrel at the shoulder is 0.560

 

[HandgunHTR]

The muzzle diameter on my 260 Rem is 0.690" and it is threaded 5/8-24. It works just fine with my DT suppressors.

 

[hseII]

The muzzle diameter on my 260 Rem is 0.690" and it is threaded 5/8-24. It works just fine with my DT suppressors.

The Ruger American Predators are around 0.690" also- 5/8"x24.

I don't have any reason to think a 0.700"-0.0730" with a #3 20"ish wouldn't work also, but I am looking for feedback.

 

[Mike D Texas]

Here's a guide:

GUNSMITHING SERVICES: Muzzle Threading AND Crowning service

The incredible surge in the popularity of suppressors makes a threaded muzzle almost standard equipment on today's precision rifle. LRI is well-equipped for this extremely popular upgrade. With our resources and experience, your device will attach trouble-free every time. Muzzle threads for...

www.longriflesinc.com

Excellent resource. Thanks for posting.

 

[Mike D Texas]

The Ruger American Predators are around 0.690" also- 5/8"x24.

I don't have any reason to think a 0.700"-0.0730" with a #3 20"ish wouldn't work also, but I am looking for feedback.

The article above specifically addresses the Bartlein 3 barrel. They recommend 18" max finished length for sufficient diameter.

 

[Tac-O]

Many suppressor mfg recommend a min muzzle diameter of 0.730 for threading 5/8 to create sufficient shoulder. However, you can see above some rifle mfg don't feel the same way.

If you want a longer barrel and also want 5/8 thread instead of using a thread adapter from 1/2 or 9/16 to 5/8, then you can send to a place like kampfeld customs and he'll install a semi-permanent collar to act as a shoulder. That way you can thread a 0.630 diameter muzzle to 5/8 and it will have plenty of shoulder.

I just did this with my Tikka factory barrel. I had a guy cut it enough to get 0.630 diameter (ended up being almost 22" after cutting) then thread to 5/8 and install a semi-permanent collar. So there's now a 0.800+ diameter shoulder to tighten the suppressor against.

 

[hseII]

Many suppressor mfg recommend a min muzzle diameter of 0.730 for threading 5/8 to create sufficient shoulder. However, you can see above some rifle mfg don't feel the same way.

If you want a longer barrel and also want 5/8 thread instead of using a thread adapter from 1/2 or 9/16 to 5/8, then you can send to a place like kampfeld customs and he'll install a semi-permanent collar to act as a shoulder. That way you can thread a 0.630 diameter muzzle to 5/8 and it will have plenty of shoulder.

I just did this with my Tikka factory barrel. I had a guy cut it enough to get 0.630 diameter (ended up being almost 22" after cutting) then thread to 5/8 and install a semi-permanent collar. So there's now a 0.800+ diameter shoulder to tighten the suppressor against.

View attachment 587967

The differences are exactly why I'm asking.

If 0.100" over the threads, then why is ~0.730" not enough?

 

[hseII]

The article above specifically addresses the Bartlein 3 barrel. They recommend 18" max finished length for sufficient diameter.

I don't have one in my hands,
But if 0.012" is the taper per inch for the #3, then the .670" + 5 x 0.012" should net 0.730", which would be above the 0.625" + 0.100".

I asked before the link was posted- maybe I'm looking at it wrong?