Reversing a Barrel when Rechambering

Get or give advice on equipment, reloading and other technical issues.

Moderator: Mod

Message
Author
AlexE
Posts: 42
Joined: Fri Feb 16, 2018 9:18 am

Reversing a Barrel when Rechambering

#1 Postby AlexE » Sun Jul 22, 2018 3:27 pm

G'day Folks,

I have a 30", 1.25" straight 260 Ackley barrel that I am rechambering to 6.5 grendel, 20" long for uses other than f class. The barrel has around 600 rounds through it.

The smith (I won't name names at present) suggested that since the barrel does not have canted lands, flipping the barrel and using what is currently the muzzle end as the new chamber end would be a good idea, since we are removing the first 10" of the barrel.

I have never heard of this before. Obviously the driving side of the lands will be reversed, and I think his thinking is that the "new" driving side will be in better nick and I'll get a better performing barrel.

Any feedback?

Wal86
Posts: 138
Joined: Sun Nov 20, 2016 5:10 pm
Location: Kilmore, VIC

Re: Reversing a Barrel when Rechambering

#2 Postby Wal86 » Sun Jul 22, 2018 4:12 pm

BAD BAD idea "laughable" whom suggested it should know better

AlanF
Posts: 6779
Joined: Wed Jun 15, 2005 8:22 pm
Location: Maffra, Vic

Re: Reversing a Barrel when Rechambering

#3 Postby AlanF » Sun Jul 22, 2018 4:46 pm

If the smith gauged the bore diameter and found no taper, and the proposed new muzzle area was in good condition, what would be the problem?

Wal86
Posts: 138
Joined: Sun Nov 20, 2016 5:10 pm
Location: Kilmore, VIC

Re: Reversing a Barrel when Rechambering

#4 Postby Wal86 » Sun Jul 22, 2018 5:13 pm

That's the thing Alan the barrels bore diameter will have a taper, and if you chamber it from the other end the muzzle will be larger... (This taper will be exaggerated as the barrel is a 260 Ackley and 600 rnds old and will have worn..)

Tim N
Posts: 830
Joined: Fri Jan 25, 2013 8:18 pm
Location: Branxton NSW

Re: Reversing a Barrel when Rechambering

#5 Postby Tim N » Sun Jul 22, 2018 7:13 pm

I would think the “best” end should be the muzzle?
We don't rise to the level of our expectations, we fall to the level of our training. Archilochos 680-645 BC

David B
Posts: 97
Joined: Fri Aug 21, 2009 10:31 am

Re: Reversing a Barrel when Rechambering

#6 Postby David B » Mon Jul 23, 2018 8:01 am

would most likely end tears, the direction of the lapping and any taper.......would be pointing to the muzzle. (in a good quality barrel)

AlexE
Posts: 42
Joined: Fri Feb 16, 2018 9:18 am

Re: Reversing a Barrel when Rechambering

#7 Postby AlexE » Mon Jul 23, 2018 9:30 am

Thanks fellas. I'm well out of my depth here, so I appreciate the nudge in the right direction.

I might use this as an excuse to use my regular smith (Lee at Trentech), even if his wait times are quite high at present. I suppose there's a reason for that.

KHGS
Posts: 598
Joined: Thu Oct 20, 2005 12:46 am
Location: Cowra NSW
Contact:

Re: Reversing a Barrel when Rechambering

#8 Postby KHGS » Mon Jul 23, 2018 6:38 pm

AlexE wrote:G'day Folks,

I have a 30", 1.25" straight 260 Ackley barrel that I am rechambering to 6.5 grendel, 20" long for uses other than f class. The barrel has around 600 rounds through it.

The smith (I won't name names at present) suggested that since the barrel does not have canted lands, flipping the barrel and using what is currently the muzzle end as the new chamber end would be a good idea, since we are removing the first 10" of the barrel.

I have never heard of this before. Obviously the driving side of the lands will be reversed, and I think his thinking is that the "new" driving side will be in better nick and I'll get a better performing barrel.

Any feedback?


Well I have to say that this statement is totally incorrect & could only be made by someone who is very inexperienced in the field of gunsmithing. #-o #-o
Keith H.

AlexE
Posts: 42
Joined: Fri Feb 16, 2018 9:18 am

Re: Reversing a Barrel when Rechambering

#9 Postby AlexE » Mon Jul 23, 2018 7:26 pm

KHGS wrote:
AlexE wrote:G'day Folks,

I have a 30", 1.25" straight 260 Ackley barrel that I am rechambering to 6.5 grendel, 20" long for uses other than f class. The barrel has around 600 rounds through it.

The smith (I won't name names at present) suggested that since the barrel does not have canted lands, flipping the barrel and using what is currently the muzzle end as the new chamber end would be a good idea, since we are removing the first 10" of the barrel.

I have never heard of this before. Obviously the driving side of the lands will be reversed, and I think his thinking is that the "new" driving side will be in better nick and I'll get a better performing barrel.

Any feedback?


Well I have to say that this statement is totally incorrect & could only be made by someone who is very inexperienced in the field of gunsmithing. #-o #-o
Keith H.


Does someone need training to call themselves a gunsmith, or just the right licence and a lathe?

bruce moulds
Posts: 2350
Joined: Sun Jun 19, 2005 4:07 pm

Re: Reversing a Barrel when Rechambering

#10 Postby bruce moulds » Mon Jul 23, 2018 7:43 pm

and there is also the "lay" of the steel in cut rifles barrels to consider.
the bullet is only meant to go 1 way.
keep safe,
bruce.
"SUCH IS LIFE" Edward Kelly 11 nov 1880
http://youtu.be/YRaRCCZjdTM

BATattack
Posts: 939
Joined: Mon Dec 29, 2008 10:29 pm

Re: Reversing a Barrel when Rechambering

#11 Postby BATattack » Mon Jul 23, 2018 7:45 pm

A good gunsmith is like any trade. If you want a good job dont expect it to be quick or cheap.

AlexE
Posts: 42
Joined: Fri Feb 16, 2018 9:18 am

Re: Reversing a Barrel when Rechambering

#12 Postby AlexE » Mon Jul 23, 2018 8:25 pm

KHGS wrote:
Well I have to say that this statement is totally incorrect & could only be made by someone who is very inexperienced in the field of gunsmithing. #-o #-o
Keith H.


Keith, I just sent you an email

Frank Green
Posts: 200
Joined: Wed May 28, 2014 11:48 pm

Re: Reversing a Barrel when Rechambering

#13 Postby Frank Green » Tue Jul 24, 2018 1:54 am

I've read all the comments and I'll give you my thoughts.

First I will assume a new barrel.

In regards to the direction of rifling and a cut rifled barrel and if it's a straight blank. Which end you thread and chamber doesn't matter. The lay of the finish is in direction of bullet travel. So don't worry about that. This question gets asked pretty often by the bench shooters. Now if the barrel is contoured like a sporter/palma etc...you cannot flip it around. The contoured barrel won't let you of course.

Canted lands do you mean 5R style rifling? Our barrels the sides of the lands are mirror images. So again it doesn't matter. Same with conventional style rifling. You think one end is tighter then flip it around. Won't hurt anything. Been there! Done that!

Now if the barrel has been shot.....you throw in a variable. The breech end will get wear and open up slightly. No way around it. If you cut enough of the breech end off probably won't hurt anything. The other thing to think about is the chamber reamer. Being as the barrel has been fired you never really get all of the carbon fouling out of it. The hard carbon will not necessarily be nice to the chamber reamer. It might dull the tool, cause issues and it might not. So food for thought on that one.

Later, Frank
Bartlein Barrels

Frank Green
Posts: 200
Joined: Wed May 28, 2014 11:48 pm

Re: Reversing a Barrel when Rechambering

#14 Postby Frank Green » Tue Jul 24, 2018 2:14 am

AlanF wrote:If the smith gauged the bore diameter and found no taper, and the proposed new muzzle area was in good condition, what would be the problem?


I agree with Alan's statement.

The hard part here is you are measuring a couple of different things. Bore size and groove size. Most people don't have proper tools to measure the bore and groove size properly and get consistent/proper readings.

Later, Frank

KHGS
Posts: 598
Joined: Thu Oct 20, 2005 12:46 am
Location: Cowra NSW
Contact:

Re: Reversing a Barrel when Rechambering

#15 Postby KHGS » Tue Jul 24, 2018 8:32 am

Frank Green wrote:I've read all the comments and I'll give you my thoughts.

First I will assume a new barrel.

In regards to the direction of rifling and a cut rifled barrel and if it's a straight blank. Which end you thread and chamber doesn't matter. The lay of the finish is in direction of bullet travel. So don't worry about that. This question gets asked pretty often by the bench shooters. Now if the barrel is contoured like a sporter/palma etc...you cannot flip it around. The contoured barrel won't let you of course.

Canted lands do you mean 5R style rifling? Our barrels the sides of the lands are mirror images. So again it doesn't matter. Same with conventional style rifling. You think one end is tighter then flip it around. Won't hurt anything. Been there! Done that!

Now if the barrel has been shot.....you throw in a variable. The breech end will get wear and open up slightly. No way around it. If you cut enough of the breech end off probably won't hurt anything. The other thing to think about is the chamber reamer. Being as the barrel has been fired you never really get all of the carbon fouling out of it. The hard carbon will not necessarily be nice to the chamber reamer. It might dull the tool, cause issues and it might not. So food for thought on that one.

Later, Frank
Bartlein Barrels

This thread has been about used barrels not new, I do agree with your thoughts on new barrels where conventional rifling is used though. However it is (in my opinion) a no no with a barrel that has seen use, depending on how much use & what the barrel is to be used for. I am assuming match use in keeping with this forum.
I have chambered a few (in the thousands) new barrels & rechambered a few (many) over the last 40 years & have never had an issue with carbon affecting my reamers (I do take steps to prevent this).
There are other issues that make rechambering a well used barrel somewhat different to chambering a new blank. Each job has to be evaluated before jumping into it & the right steps followed. Knowing what the right steps are is the trick & depends on the experience of the gunsmith. Gunsmithing is NOT rocket science, but owning a lathe & a chambering reamer does not make one a gunsmith.
Keith H.


Return to “Equipment & Technical”

Who is online

Users browsing this forum: No registered users and 3 guests