Uni throater

[boiler_house7]

got a 7mm saum with .210 freebore shooting the 180 VLD. Look like the pressure ring around .010 out of the shoulder junction at .001 in from hard jam. Well all was good going into the 3rd firing on brass and noticed now when I seat the bullet in on the 3rd fired brass I get into the last .015-.020 and the bullet just snaps in. I'm sizing with a warner bushing and it does somewhat size like the redding bushing not quite to the shoulder. The groups have opened up as well. Looks like .025 more freebore will possibly fix the problem. I have a sizable amount in dies and was wondering if the uni thoater maybe a quality fix. I was thinking on taking the barrel off and getting the pilots for proper fit to do the job by Hand? I have two barrels that where shooting well to address and one into the gunsmith for a chamber now with my current reamer. Two fold, should I send my reamer back to get more freebore for the new barrel or would the uni throater do a quality job with my existing reamer. My chamber is a .316 neck and sizing to .310 and loaded rounds is .312 so I don't think I'm working the brass to hard. Thanks Bill

 

[Erik Cortina]

The uni-throater will do an excellent job. I did mine by hand and used the bushing they provide with it for a 7mm and it was fine. I had been told this by Steve Blair, but the finish is much better with the uni-throater than with the original reamer. I was amazed.

 

[Bob3700]

I see two paths here. You can purchase the unithroater but then how do you control the depth of the cut? If you try to freehand the operation, you can cut too deep and end up with excessive freebore.

You could take your reamer and have it reground with the additional freebore to match the bullet you are shooting.

If you use the unithroater, I would want one of the Lambert reamer micro-stops. That will allow you to adjust the throat depth to the .001".

Just as an FYI, boattail bullets, in my experience, don't have pressure rings. So it is just the brass flowing into the shoulder neck junction (a donut) that is causing the problem.

You could also get an inside neck reamer to eliminate the donut.

Couple of ways to skin that cat. Easiest is to have the reamer reground.

Bob

 

[ridgeway]

Bob, I believe a uni throater has its own micro adjustable collar built into it?

 

[Patch700]

Bob, I believe a uni throater has its own micro adjustable collar built into it?

The pacific tool Uni Throater does indeed have adjustability to the depth of cut , i just finished ordering both a 6.5x47L reamer from them , expidited btw thx Erik for the tip. (.293 Nk /.160 FB) and also got the Unithroater as well in the event i want to stretch it to .180 or more.

 

[Erik Cortina]

The uni-throater has a stop collar on it.

 

[boiler_house7]

Thanks for the replies. Bob I thought the same thing has a donut deal going and I do anneal ever firing, but I am just not seeing a spike on the tension indicator. Smooth and then last .020 or so "click" seated. did not do this until 3rd fired brass. the pressing ring is out of the shoulder junction area by .010 or so but where the bushing does not size is where the press ring is in. so I'm guessing that where the tension is releasing. Anyways I think my fix is a little more freebore. Eric thanks as always. I used a uni throater on a 260AI, my hunting gun a year or so ago and it shot well. I just got a little mulla tied up in the dies and was hoping I could continue with my reamer if I got a throater for the 7 and it would still fine on a long string basis and still be competitive. Thanks Bill
Oh and Eric you was right, I got a Randolph rest I'll trade for a NEO. Them lowboy stocks sure long, my ape ass arms not long enough to stay in position.

 

[butchlambert]

Thanks for the replies. Bob I thought the same thing has a donut deal going and I do anneal ever firing, but I am just not seeing a spike on the tension indicator. Smooth and then last .020 or so "click" seated. did not do this until 3rd fired brass. the pressing ring is out of the shoulder junction area by .010 or so but where the bushing does not size is where the press ring is in. so I'm guessing that where the tension is releasing. Anyways I think my fix is a little more freebore. Eric thanks as always. I used a uni throater on a 260AI, my hunting gun a year or so ago and it shot well. I just got a little mulla tied up in the dies and was hoping I could continue with my reamer if I got a throater for the 7 and it would still fine on a long string basis and still be competitive. Thanks Bill
Oh and Eric you was right, I got a Randolph rest I'll trade for a NEO. Them lowboy stocks sure long, my ape *** arms not long enough to stay in position.

A little more freebore may fix it. I have my carbide neck sizing bushings with almost no radius to allow them to size further down the neck. If you get tired of your Warner Die I might need another. The Unithroater that I have from PT&G has adjustable stops. Are you able to run an expander in the neck and take a cut with your neck turning tool? If you have a donut it will push it outside and turning the necks will cut the donut from the outside.

 

[jsthntn247]

Could someone post a pic or video of what you mean when you say hand throating with a uni throater. I'm assuming your still setting it up in a lathe and just turing the lathe by hand?

 

[Erik Cortina]

Could someone post a pic or video of what you mean when you say hand throating with a uni throater. I'm assuming your still setting it up in a lathe and just turing the lathe by hand?

No, they sell a "T" handle for the uni-throater that extends past the action. All you do is clean barrel really good, apply cutting oil to reamer, run reamer and let bushing engages the lands. Push in until you feel the reamer contact the lands and turn the handle. It takes one or two turns depending on how much you are cutting. Turn reamer until you don't feel it cutting any more, retrieve, clean barrel, and if at right depth, you are done.

It's super easy. I did not even take scope off or anything. It took me about 5 minutes and that's because I extended my freebore by .100", so I took it in steps.

 

[butchlambert]

You really don't need a lathe for this.

 

[Patch700]

https://shop.pacifictoolandgauge.com/index.php?main_page=index&cPath=1_71&zenid=7ju0scfu1fo06q0lqvasrg8rj5

 

[Bamban]

If I were to order a Uni throater, how do I go by spelling out the specs?

I am looking for lengthen the throat of a Wylde chamber in my AR match rifle to best accommodate the longer 80.5 Bergers. I think the Wylde reamer has .224 free bore diameter, 0.0619 in length, and leade angle of 1 degree 15.

 

[Erik Cortina]

If I were to order a Uni throater, how do I go by spelling out the specs?

I am looking for lengthen the throat of a Wylde chamber in my AR match rifle to best accommodate the longer 80.5 Bergers. I think the Wylde reamer has .224 free bore diameter, 0.0619 in length, and leade angle of 1 degree 15.

Just call PT&G and order one for a .22 caliber. The throater is adjustable so you would have to adjust it to the desired depth. Once you are there, lock it and from there on all your chambers will have the same freebore. Read the link below and you will get an understanding on how they work.

https://shop.pacifictoolandgauge.com/index.php?main_page=product_info&cPath=1_71&products_id=1055&zenid=7ju0scfu1fo06q0lqvasrg8rj5

 

[Bamban]

Erik,

Thank you!


Nez

 

[wapiti25]

+1 0n the Uni-Throater. I have two.