Eric cortina bolt shroud

[Captrayj]

Anybody have a guess if this will help a defiant deviant long action in 284? Just trying to squeeze all the performe I can get for 1000 F CLASS SHOOTING. THANKS. Captrayj

 

[misser]

if eric does it ,it has to be for a good reason

 

[F Class John]

Anybody have a guess if this will help a defiant deviant long action in 284? Just trying to squeeze all the performe I can get for 1000 F CLASS SHOOTING. THANKS. Captrayj

FWIW, both my Defiances had beta shrouds from him on them and I did notice a difference for sure. Then mid-year when I switched to a used Borden and I once again had a beta version on it and it's what I had when I won mid-range Nationals. I know people will assume I'm just biased because I'm friends with Erik but the shroud does help reduce weird stuff from happening in your ignition system. I have two new Bordens arriving this week and both of them now come with his improved shrouds (which by all accounts should be even better than the beta versions I was testing).

Easiest way to know if you could benefit from these is to take apart your current assembly and look inside your shroud, if you see any wear marks, then you'll probably benefit from these. Before I switched mine over, there was noticeable wear inside the shrouds.

 

[Raydee]

Do these fit any of the Rem 700 style actions?

 

[F Class John]

Do these fit any of the Rem 700 style actions?

From my understanding yes it'll fit all factory 700 bolts but there's always a chance with custom actions it may not fit (because they're clones but not always exact clones) however Erik is always good about with customers if there's a problem.

 

[JoshP]

Do these fit any of the Rem 700

Anybody have a guess if this will help a defiant deviant long action in 284? Just trying to squeeze all the performe I can get for 1000 F CLASS SHOOTING. THANKS. Captrayj

it will help for sure. However I’m pretty sure it won’t fit a defiance because of a propriety cut in their bolt. I think there will be a run for defiance actions at some point in the future.

 

[JoshP]

Do these fit any of the Rem 700 style actions?

No. Many of the custom action makers have proprietary threads or diameters that don’t allow a stock 700 shroud to fit. Best to ask. I think he will have more offerings for specific models in the future.

 

[Captrayj]

It’s shipped should receive it soon,,,I told Eric what it was for,,,,so hopefully will fit. Iill keep you all posted..
Thanks Ray

 

[tom]

Hard to say if you replace something that fits with something else that fits.....probably will help?

What for certain works is oversized, and then fitted to that particular bolt. Such as the ones Alex did for my Bat B, Borden Brm, and Eric's personal Brmxd....which is where the idea came from I assume.

Tom

 

[Jud96]

This is my opinion, but I don’t see how a shroud that’s made to fit in every bolt from one manufacturer is supposed to fix anything. If the bolts vary in dimensions at all, even .001-.0015, then the shroud is either tight or loose. I know what it’s like trying to make shrouds and bolts fit nicely in a production environment. I don’t think you’re going to make a shroud fit well without tailor fitting it to each individual bolt or be controlling the tolerances on the bolts yourself. Defiance, BAT, Borden, those guys make good parts, I simply don’t see how an off the shelf shroud would work better than what they’re doing. And for Remington? Good luck, their stuff is all over the place. The shroud being perfect is only half the problem, it’s not going to fix a screwed up bolt or firing pin.

Listen to @tom , what those guys are doing works and is the only way to make it perfect.

 

[xr650rRider]

The shroud modifications were in the book "The book of rifle accuracy" by Tony Boyer from 2010. In one of the Speedy videos, he seemed to suggest those were mods he did and Gene McMillan is who we learned from. In the book they drilled out the shroud with a 5/16" bit for about half the length of the firing pin guide length. I use a small carbide boring bar and leave about 0.2" in front and back and relieve everything in between. Eric's new one (Speedy design), they make a relief cut where the cross pin hole is in the cocking piece area of the shroud. The older Defiance Deviant was drilled like a 700 and that would work but at least the Tenacity has the cross pin hole at an angle. The shroud would still work but the relief cuts don't line up with the cross pin. The Tenacity shroud is also 1/2"-24 thread, so a standard 1/2"-13 won't work.
If you have the ability to modify them, I think Kelbly's sells a shroud for around $10, Defiance sells them for around $30.
https://kelbly.com/product/remington-bolt-shroud-steel/
https://defiancemachine.com/product-category/bolt-shrouds/

 

[Erik Cortina]

which is where the idea came from I assume.

Nah, I learned this from Speedy over a decade ago.

Oversizing the shroud only fixes one issue, of which there are many with rem shrouds.

 

[tvaught]

wow

 

[jackieschmidt]

Nah, I learned this from Speedy over a decade ago.

Oversizing the shroud only fixes one issue, of which there are many with rem shrouds.

Some years ago, I bored and threaded a piece to 1/2 13 tpi, then screw a Remington shroud into it.Using a test indicator, the firing pin hole ran out about .005 with the threads.
What’s more, the area that the cocking piece fit into did not run true with the firing pin hole.

These are things you find out if you know how to actually test things. I rarely take someone’s word on accuracy of machined parts. Even if it’s in a book.

I check for myself.

 

[Alex Wheeler]

The shroud modifications were in the book "The book of rifle accuracy" by Tony Boyer from 2010. In one of the Speedy videos, he seemed to suggest those were mods he did and Gene McMillan is who we learned from. In the book they drilled out the shroud with a 5/16" bit for about half the length of the firing pin guide length. I use a small carbide boring bar and leave about 0.2" in front and back and relieve everything in between. Eric's new one (Speedy design), they make a relief cut where the cross pin hole is in the cocking piece area of the shroud. The older Defiance Deviant was drilled like a 700 and that would work but at least the Tenacity has the cross pin hole at an angle. The shroud would still work but the relief cuts don't line up with the cross pin. The Tenacity shroud is also 1/2"-24 thread, so a standard 1/2"-13 won't work.
If you have the ability to modify them, I think Kelbly's sells a shroud for around $10, Defiance sells them for around $30.
https://kelbly.com/product/remington-bolt-shroud-steel/
https://defiancemachine.com/product-category/bolt-shrouds/

The root cause of the cross pin walking out is the hole size in the firing pin. Thats the real fix for the problem. I have never seen a cross pin walk out on a defiance enough to see it drag in the shroud. This is an isolated issue.

 

[Captrayj]

Bolt shroud didn’t fit. Was very very tight (defiance deviant long action 284) retuned to Cortnia Precision.

 

[jackieschmidt]

Bolt shroud didn’t fit. Was very very tight (defiance deviant long action 284) retuned to Cortnia Precision.

Machining tolerances.
The manufacture for the Cortina Shroud attempts to keep the thread pitch diameter at the top side.so to keep the shroud from being too loose, and the rifle manufacture keeps the bolt thread on the low side for the same reason.

It happens…….BUT. ……Do keep in mind that these shrouds are made on a CNC Setup that that is very difficult to change for a special part. Eric will have to request to the manufacturer to make the change. Good luck.

I could fix it quite easily.

 

[Erik Cortina]

Bolt shroud didn’t fit. Was very very tight (defiance deviant long action 284) retuned to Cortnia Precision.

The shrouds are meant for Remington 700 actions, not Defiance.

We offer some now that will fit Defiance.

Cortina Precision Bolt Shroud | Cortina Precision

(Bergara B14R bolt shroud) Stainless steel billet construction. Improves fit and finish compared to factory offerings. Available in Stainless Steel finish or Nitride finish. Bergara B14R kit includes replacement spring. (Remington 700) We teamed up with Hall of Fame Benchrest shooter and...

www.shootsmallgroups.com

 

[Erik Cortina]

Machining tolerances.
The manufacture for the Cortina Shroud attempts to keep the thread pitch diameter at the top side.so to keep the shroud from being too loose, and the rifle manufacture keeps the bolt thread on the low side for the same reason.

It happens…….BUT. ……Do keep in mind that these shrouds are made on a CNC Setup that that is very difficult to change for a special part. Eric will have to request to the manufacturer to make the change. Good luck.

I could fix it quite easily.

No, the shrouds were never meant for Defiance or any other Remington clone action. That's why they are tight or too big because Remington 700's are larger than clones.

We have two different size shrouds now to fit Remington Defiance and some Kelbly actions.

Cortina Precision Bolt Shroud | Cortina Precision

(Bergara B14R bolt shroud) Stainless steel billet construction. Improves fit and finish compared to factory offerings. Available in Stainless Steel finish or Nitride finish. Bergara B14R kit includes replacement spring. (Remington 700) We teamed up with Hall of Fame Benchrest shooter and...

www.shootsmallgroups.com

 

[jackieschmidt]

Ok