REAMING A CHAMBER

[cmysix]

when I rebarrel, I want too use a German Salazar Reamer 30-06 do you just use a 30-06 rougher reamer and then the finish reamer or does it have to be a matched set?

 

[paperpuncher]

I would just use a finisher no rougher needed

 

[jackieschmidt]

I chambered my custom 30-06 with the GS reamer. It is prefect for bullets like the 178 grn. Amax.

 

[shortgrass]

Just do a search in the gunsmithing section. Chambering has been discussed to death!

 

[Shrek]

Just do a search in the gunsmithing section. Chambering has been discussed to death!

It’s true that chambering has been discussed before but this is a discussion board not a library. It has all been discussed before somewhere but not by the OP. I don’t know how many times I’ve discussed the same topics and told the same tired stories but my friends still listen and I listen to theirs. Never know when some new sliver of knowledge will spring forth. Just because they remake a movie doesn’t mean it’s a stale tired story. It’s new to all who never saw the original. Heck , often it’s all new because they weren’t even born when the original was made. Same here. It’s a new topic for the OP.

 

[shortgrass]

At the very top of the "Advanced Gunsmithing & Engineering" page, there's a 130 page PDF that is about chambering. A very good selection of material written by gunsmiths. If you use this site like a library, there is loads of info available at your finger tips.

 

[hpshooter]

At the very top of the "Advanced Gunsmithing & Engineering" page, there's a 130 page PDF that is about chambering. A very good selection of material written by gunsmiths. If you use this site like a library, there is loads of info available at your finger tips.

Lots of information from very competent gun builders in those 130 pages.

 

[Spotshooter]

Look into using a drill to open up the body instead of a roughing reamer, and then using the finish reamer to go from there... make sure you are dialed in before you drill it, and your drill is smaller than the shoulder, and you don’t drill down all the way to the shoulder... and redial in off the bore (not lands) in the neck area before you start with the finish reamer.

 

[AckleymanII]

Check your set up to see if it has shifted during the drilling if you are looking for .0001 run out in the throat when you are done. Using a boring bar causes less stress on the set up.

 

[shortgrass]

Look into using a drill to open up the body instead of a roughing reamer, and then using the finish reamer to go from there... make sure you are dialed in before you drill it, and your drill is smaller than the shoulder, and you don’t drill down all the way to the shoulder... and redial in off the bore (not lands) in the neck area before you start with the finish reamer.

If you are going to use a drill bit, it needs to be new or ground on a precision drill grinder. Drill under sized enough that you can make a pass or 2 with a boring bar, preferably set with the taper the same as is on the cartridge you intend to chamber. But, it will work if you bore a straight hole. Check your 'dial-in' before boring. Bore under size and let the finish chambering reamer do the clean-up, shoulder, neck and throat. It never hurts to check and double check your set-up. If the barrel slips from drilling, the set-up isn't rigid enough to ream IMO. I leave a minimum of .030" bored hole diameter for the reamer to cut. But, do it any way you want! If ya' screw up, figure out why and how (you screwed-up)! With a bit more than 46yrs of machining experience I approach chambering as a delicate machining op that needs to be 'dead on". There's no real 'magic' to it, just attention to detail.

 

[Spotshooter]

Short grass - thanks - I left off the touch up with a boring bar light pass touch up....
I came back to add it and saw you did.

I completely agree on triple measuring, and taking your time, and use just over .030 at the shoulder as well..

 

[carlsbad]

There is a reason it is called "prebore" instead of "predrill".

 

[Stephen Frith]

There is a reason it is called "prebore" instead of "predrill".

It is just bore or drill. There is absolutely no reason for wasting 3 spaces in adding" pre" to most any word. Prebaked ham any different than a baked ham?
Prefinished? Geez.
S

 

[carlsbad]

It is just bore or drill. There is absolutely no reason for wasting 3 spaces in adding" pre" to most any word. Prebaked ham any different than a baked ham?
Prefinished? Geez.
S

You just wasted an entire paragraph....

 

[rgc54]

Step 1. Setup barrel in headstock
Step 2. Indicate both ends of barrel
Step 3. Bore chamber undersize
Step 4. Check barrel for running true
Step 5. Ream chamber to proper headspace.

Hence. The term pre bore

 

[6ShotsOr5?]

I think I’m getting pre-bored.

 

[Dusty Stevens]

It is just bore or drill. There is absolutely no reason for wasting 3 spaces in adding" pre" to most any word. Prebaked ham any different than a baked ham?
Prefinished? Geez.
S

How bout 2 in 1? You cant put another something in the jug where 1 already is

 

[AccelR8]

How bout 2 in 1? You cant put another something in the jug where 1 already is

Then there's the ever popular "Hot Water Heater."

 

[Dusty Stevens]

Then there's the ever popular "Hot Water Heater."

Atm machine

 

[Shrek]

Step 2. Indicate both ends of the barrel.

Why do I need to indicate the muzzle end of the barrel ? The bore isn’t straight. How about zeroing out under the center of the chamber end spider/chuck and just forward of where the lead will end. That way your bullet enters the bore strait so it can follow the crooked spiraling bore ? Thead the tennon and bore the chamber in alignment with the bore where the bullet enters the barrel is my understanding of best practice.