The FAL Files  

Go Back   The FAL Files > Weapon Specific Forums > The Bolt Action Files

Notices

Reply
 
Thread Tools Display Modes
Old June 28, 2019, 12:41   #1
kurbelgehause
Registered
Bronze Contributor
 
kurbelgehause's Avatar
 
FALaholic #: 14698
Join Date: Jun 2004
Location: Utah
Posts: 1,061
1903A3 Barrel - Used or New?

Hello All,

I am trying to get my hands on a short chambered Smith Corona 1903A3 barrel to install on a stripped receiver.

I found one that the seller says is new but it is not wrapped in original packaging.

I can buy it and get time to inspect it so it can be returned if found to be used.

Is there a way to determine if a barrel is short chambered?

How would it be measured?

Thanks!
__________________
Always with the negative waves, Moriarity. Always with the negative waves!
kurbelgehause is online now   Reply With Quote
Old June 28, 2019, 13:15   #2
tdb59
Are We Awake ?
Bronze Contributor
 
tdb59's Avatar
 
FALaholic #: 63177
Join Date: Mar 2011
Location: ironsman.com
Posts: 10,959
A new 03a3 barrel will be ~.050" short in the chamber.

Install the barrel by hand just to shoulder contact, and check headspace.

The bolt should not begin to turn. The extractor must be removed first, of course.

Make certain that no hardened cosmolene or other gunk is in the chamber.


................................
__________________
A rut is just a shallow grave with the ends kicked out.

...............
tdb59 is offline   Reply With Quote
Old June 28, 2019, 15:58   #3
kurbelgehause
Registered
Bronze Contributor
 
kurbelgehause's Avatar
 
FALaholic #: 14698
Join Date: Jun 2004
Location: Utah
Posts: 1,061
Quote:
Originally Posted by tdb59 View Post
A new 03a3 barrel will be ~.050" short in the chamber.

Install the barrel by hand just to shoulder contact, and check headspace.

The bolt should not begin to turn. The extractor must be removed first, of course.

Make certain that no hardened cosmolene or other gunk is in the chamber.


................................

Thanks! I will try that.
__________________
Always with the negative waves, Moriarity. Always with the negative waves!
kurbelgehause is online now   Reply With Quote
Old June 29, 2019, 12:34   #4
V guy
Dinosaur
Silver Contributor
 
V guy's Avatar
 
FALaholic #: 10282
Join Date: Apr 2003
Location: miami
Posts: 17,635
That short chambered 03A3 bbl will be .005-.010 short, not .050, in my experience.

Having installed a few, the bbl shoulder may have to be cut a bit as the index marks on the bbl and receiver may not be close enough to install, without a 4' cheater bar. I like about 1/4" difference between the witness marks before I torque.

Take you time reaming that chamber. I use a handled driver, from the back end. Ream few turns, EVENLY; check headspace. Repeat, until it just closes on the go gage. Takes a bit of effort. Go slow.
V guy is online now   Reply With Quote
Old June 29, 2019, 15:40   #5
TARGSHOOT
Registered
 
FALaholic #: 15002
Join Date: Jul 2004
Location: Beaches south Of Houston
Posts: 125
03/A3 barrel

I've got a 6/44 Niw in the wrap Remington barrel if you change your mind.....
__________________
GRANNY"S Response to everything " Its Those Damn Communist Again"
TARGSHOOT is offline   Reply With Quote
Old June 29, 2019, 17:13   #6
tdb59
Are We Awake ?
Bronze Contributor
 
tdb59's Avatar
 
FALaholic #: 63177
Join Date: Mar 2011
Location: ironsman.com
Posts: 10,959
Quote:
Originally Posted by V guy View Post
That short chambered 03A3 bbl will be .005-.010 short, not .050, in my experience.

....
amazing


Go to No-Go is only .006".




Pull-through reamers are worth the expense, BTW.


.....................
__________________
A rut is just a shallow grave with the ends kicked out.

...............
tdb59 is offline   Reply With Quote
Old July 15, 2019, 11:53   #7
V guy
Dinosaur
Silver Contributor
 
V guy's Avatar
 
FALaholic #: 10282
Join Date: Apr 2003
Location: miami
Posts: 17,635
I actually had one NOS, that needed almost no reaming at all, maybe 3 turns with the reamer. That one was definitely .005-.010 short. I noted that the bolt was closer to closing than I had suspected it would be with the go-gage, before reaming.

That .005-.010 is a warning, that you MIGHT have one as close as the one above, and going too far, can happen to those who have not reamed a chamber before, using ENTHUSIASM, instead of care.

I have not owned a pull thru reamer, as the "chips" build up issue, can jam up the bolt, and voila, too deep.

That said, I have no way of easily measuring just how short the chamber is, but checking often is necessary (and to clear the chips out). I will bet I have not had one more than .030 short, based upon reaming time.

Assuming that any NOS bbl is .050+- short, could be a recipe for a mistake for someone who has not done it before.
V guy is online now   Reply With Quote
Old July 16, 2019, 09:46   #8
yovinny
Old Fart
Silver Contributor
 
yovinny's Avatar
 
FALaholic #: 7679
Join Date: Oct 2002
Location: NY transplant to central Illinois, Now in Kentucky
Posts: 6,191
Drop a go gauge in a vertical held barrel and measure with your depth mic to the shoulder.
Then take a measurement from the front of the receiver to the closed bolt face.
Subtracting the second from the first will tell you how much reaming is needed.

Reaming anything more than maybe .010" by hand is much better (straiter) done in the lathe first.
yovinny is online now   Reply With Quote
Old July 20, 2019, 16:01   #9
V guy
Dinosaur
Silver Contributor
 
V guy's Avatar
 
FALaholic #: 10282
Join Date: Apr 2003
Location: miami
Posts: 17,635
I hold the action vertically, clamped between two blocks, and use a piloted reamer with "t" handle to ream by hand, evenly, slowly, and concentrically.

Most people do not have a lathe, though I have two.

Using a floating reamer holder in a lathe, will insure that the chamber is concentric to the bore, and not laying to one side (down) or ovaling out the chamber, due to gravity and non concentricity of the bbbl shank.

I do not own the floating reamer holder either, but have considered it.
I try not to make mistakes as they are far easier to make than doing exact work.

A chamber that has been reamed with NON piloted full length reamer, can make the low or bottom side bigger, because of gravity and lack of care, and makes the chamber out of round... happens to amateurs doing it horizontally and it CAN happen on the lathe, without a piloted reamer too.

I was taught the fine points of chamber reaming 30 years ago, by a friend who had worked for P.O. Ackley as a young fellow. Not many of them around anymore.


P.O. said "that if it was not correct, it was a total loss".
V guy is online now   Reply With Quote
Old July 20, 2019, 17:52   #10
yovinny
Old Fart
Silver Contributor
 
yovinny's Avatar
 
FALaholic #: 7679
Join Date: Oct 2002
Location: NY transplant to central Illinois, Now in Kentucky
Posts: 6,191
Good advice from V guy,,,work vertical and slowly by hand,,,

Non-piloted chamber reamer ?? Ive not seen or heard of that myself before.

Usually with chamber treamers, the choice is between solid or live pilot.
The solid being cheaper and of the all one piece fixed position and size type.
The floating being like a bearing and able to rotate or not independent of the cutting portion and available sized to a closer fit to the actual bore...and of course more expensive.

Either can usually be used to produce an excellent chamber, either can also produce a damaged chamber if not used properly.
Live pilot reamers can be fit better to the bore and are less likely to cause miss-alignment or runout issues.

Ive only paid extra for live reamers when chambering a few match barrels, otherwise its always been solid pilot for me,,,,including some sub 1/2 moa varmint/target rifles.
yovinny is online now   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -5. The time now is 15:50.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
©1998-2018 The FAL Files