Forums.NitroExpress.com

Home | Ezine | Forums | Links | Contact NitroExpress.com: DR Build Questions NEED HELP

View recent messages : 24 hours | 48 hours | 7 days | 14 days | 30 days | 60 days | More Smilies

*** Enjoy NitroExpress.com? Participate and join in. ***

You are not logged in. [Login]

Main Index · Search · Active Topics
New user · Who's Online · FAQ · Calendar

Double Rifles, Single Shots & Combinations >> Building Double Rifles & Gunsmithing

Pages: 1

MKETOOL
.224 member

Reged: 20/09/10
Posts: 6
Loc: Ohio

DR Build Questions NEED HELP
#173531 - 21/12/10 12:40 PM

Anyone,

I finally have gotten in my shotguns and have started my project. I purchased both a sauer and simpson in 12 ga. They are very well made guns and are going to make beautiful Dr’s. I also received my barrels from McGowen Precision Barrels out of Montana. I decided on the .405 Winchester as my first build. I have taken off all of the ribs and cut off the barrels. So far so good, my question is the reaming out of the chambers. Nothing is really described in Mr. Brown's book about the convergence of the chambers. Everything says that the each chamber needs to be lined up and finished separately, but the method shown leads me to believe the chambers are completely parallel. I know that you line them up with a dowel rod in the vice, but that would mean they were parallel to each other because if you put the lugs in the vice you cannot move the receiver on a second axis that would give you any convergence of the barrels. I cannot find any information on this. On the forum, Ron Vella’s .303 build says you need to do each chamber separate and cannot mill straight across the face of both chambers because you would not be perpendicular to your threaded hole, which means they are not parallel to each other. Are you therefore adjusting the angle of the head on the Bridgeport to offset this? Mr. Brown’s book says you can also do this operation on a drill press, which means you would have to adjust your vise to a convergence angle. Also with the .405 Winchester I am not sure if I need to bush the firing pins. The shotguns I am using have smaller firing pins and have a pretty tight tolerance to the holes. I would greatly appreciate any expertise on these subjects and I hope everyone has a wonderful holiday.

Thanks,

Tim

Post Extras:

Print Post

Remind Me!

Notify Moderator

DaleS
.224 member

Reged: 17/11/09
Posts: 12
Loc: ny

Re: DR Build Questions NEED HELP [Re: MKETOOL]
#173574 - 22/12/10 01:19 AM

I am no expert but on the 450-400 I put together I bored the mono block holes parallel and threaded the same. My thought was that the barrels should be parallel to aid in regulation,it worked for me. Regulation did take about 30 rounds but I had as much vertical correction as I did horizontal, but I regulated at 100yds which may have increased my problems.

As to bushing the firing pins I used a Merkel and the pins where small and tight and I used them as is with out any problems but the 450-400 is a low pressure round.

Over all it was a fun project and only downside is the rifle is to heavy almost 12 pounds.

Good luck Dale

Post Extras:

Print Post

Remind Me!

Notify Moderator

doubleriflejack
.333 member

Reged: 11/11/07
Posts: 352
Loc: Oregon, U.S.A.

Re: DR Build Questions NEED HELP [Re: DaleS]
#173590 - 22/12/10 08:41 AM

DaleS----Since finished weight was excess, I suggest that you made barrels too thick, too heavy, a common error with Americans who are used to rifle barrels being thicker than they need to be. I strongly suggest that all conversions have firing pins bushed, regardless of the lower breech pressures or not, as proper bushings also contribute to increasing strength to rear of firing pins at breech, as found on lower strength shotgun actions. To not bush pins, and get by with it, doesn't mean that you can do it again; you are risking possibility of failure. Even W. Ellis Brown, early on, as explained in his book, made this mistake, thinking that he could get by without bushing, after previously not busing, and getting by with it, and he paid the price, an expensive stock blown to pieces, and pictured in book. I took class from him, covering the conversion process, in gunsmithing school, prior to his writing book on same subject. I sent PM, trying to answer DR build questions; hope it helps.

Post Extras:

Print Post

Remind Me!

Notify Moderator

Pages: 1

Extra information

0 registered and 24 anonymous users are browsing this forum.

Moderator: CptCurl

Print Topic

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled

Rating:
Topic views: 1310

Jump to

NitroExpress.com

Powered by UBB.threads™ 6.5.5

Home | Ezine | Forums | Links | Contact

Copyright 2003 to 2011 - all rights reserved