How to Increase Your Rifle Throat Length With a Chamber Uni Throating Reamer

ShtrRdy

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Dang, that's neat! Thanks for walking us through doing this.

In the example you presented, would you need to use an extended magazine box also?
 

2five7

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Very, very useful video. Lots of good shooting factory rifles out there with short throats. Have you been able to work up a new, faster load yet?
 

rfurman24

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Dang, that's neat! Thanks for walking us through doing this.

In the example you presented, would you need to use an extended magazine box also?

In the rifle we did this on, no.
 

RBanta66

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Did this process change your accuracy at all? Have you been able to test the 190 bullets yet? If so what were the results. But the way love your shooting bags!
 

Broz

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Did this process change your accuracy at all? Have you been able to test the 190 bullets yet? If so what were the results. But the way love your shooting bags!

I have done over a half a dozen and they all shot great. Even both our match rifle I increased the throats in. No negative results from mine.
 
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rfurman24

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Did this process change your accuracy at all? Have you been able to test the 190 bullets yet? If so what were the results. But the way love your shooting bags!


Working through development currently.

 

Ladd

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Very informative video. I liked it. Makes me want to increase the throat of my 7mm Ridgeline.
 

hindmarsh

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Here is where we can discuss and ask questions about the how to video on Increasing Your Rifle Throat Length With a Chamber Uni Throating Reamer by Ryan Furman.

To watch this how to video GO HERE View attachment 4739
Nice content, but the audio is quite low.
I almost bought one of these a while back but didn’t because I wasn’t sure I wouldn’t mess up my barrel but now I am comfortable with the process so I will probably get one. Thanks!
 

rfurman24

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Nice content, but the audio is quite low.
I almost bought one of these a while back but didn’t because I wasn’t sure I wouldn’t mess up my barrel but now I am comfortable with the process so I will probably get one. Thanks!
Thanks for the feedback. You are the second to comment on the low audio. I have played it back on two different machines and it is normal on both of mine. I will look into it for future videos.
 

jimbires

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I gave up watching , I couldn't hear it . I'm going to try again wearing my power muffs .

I'm sure it was mentioned in the video . use caution and go slow , the unithroater cuts with ease . I couldn't believe how fast and easy it cuts . I rented a reamer from 4D reamers . if you rent one be sure to rent the T handle too , it was not included with my reamer rental . I had to improvise .
 

rfurman24

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Jeff, can you report on audio? I just listened on two more machines. If I turn it to max volume it is far too loud. My sound meters are exactly where I want them.
 

Broz

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Jeff, can you report on audio? I just listened on two more machines. If I turn it to max volume it is far too loud. My sound meters are exactly where I want them.

It's a youtube thing with some laptops I think. I did have a little issue at first, but went in to my lap top audio settings and was able to boost it in the "HD Audio Manager" and check a box called "Loudness Equalization" I have seen this before with some reviews by other editors. But not always. I blamed it on my old laptop (Windows 7) and changes Youtube has made.
 

Ladd

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The audio was good on my iPhone and laptop. No issues here.


Sent from my iPhone using Tapatalk
 

rfurman24

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I set my sound to be "normal" in the center of my editing computers sound range.

I appreciate the help and the feedback! Let's get this thread back on topic.
 

mindcrime

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Shooting the earlier 2950 fps loads yielded a 60 fps loss; have you been able to test some "hotter loads" yet??? Thanks.
 

rfurman24

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We are in the middle of load development with the new chamber.
 

mindcrime

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We are in the middle of load development with the new chamber.

Please keep us informed as I have a 7mm Rem Mag (1-8" Twist) that needs some throat lengthening as well.......I have the 180 Bergers to start, but will be trying heavier pills when possible. I'll be using RL-22 however. (y)
 

rfurman24

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Please keep us informed as I have a 7mm Rem Mag (1-8" Twist) that needs some throat lengthening as well.......I have the 180 Bergers to start, but will be trying heavier pills when possible. I'll be using RL-22 however. (y)


Did you look at the thread I linked to above? It has some initial data.
 

Rhovee

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I have done this before. Took the barrel off and took an ok loaded round and dropped it in the chamber holding the barrel upside down. Took measurement. Then dropped dummy round that I had made with proper seated bullet in chamber. Measure. Then I just cut a little and dropped the dummy round back down and could see how much more I needed. Go slow. Those suckers are sharp. I assume they come with 1.5 degree lead angle?
 

Merlin

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I keep tap magic on hand also. Do you think this would clean up fire cracking on a sammi spec throat? If it is not that bad.
 

rfurman24

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I keep tap magic on hand also. Do you think this would clean up fire cracking on a sammi spec throat? If it is not that bad.
It would clean it up but you will still have fire cracking further down the barrel. I have no experience with cleaning up a throat towards the end of a barrels life but have seen repeatedly that it often only yields another couple hundred rounds. By the time you do load development on the new throat I am not sure it is worth it.
 

jimbires

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nice video . this really sums it up . before I did mine I searched the forums for info , there's not much out there on doing this . you pretty much did it about the same as I did mine . you were a little braver than me , I sure didn't cut .025 at a time . after I did mine I thought if I were to do this again I'd buy the Hornady tool , it would have saved me a bunch of time . I kept seating bullets out longer to watch my progress , the tool would have made it so much easier .
 

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The extension you didn’t use is center drilled for use with tail stock on a lathe and has flats for a wrench to hold or turn instead of the t-handle
 

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Have you or others used this reamer on a Ridgeline in 300 Win Mag to optimize seating depth for 215 Bergers ?
If so, what improvement did you see over the factory SAAMI chamber and is their standard 1:10" twist adequate for the 215s in higher humidity near sea level?
 

rfurman24

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Have you or others used this reamer on a Ridgeline in 300 Win Mag to optimize seating depth for 215 Bergers ?
If so, what improvement did you see over the factory SAAMI chamber and is their standard 1:10" twist adequate for the 215s in higher humidity near sea level?
I have not. I am not sure you will see a lot from throating a SAAMI 300WM. It's problem is not really from the throat length as far as where the ogive is going to contact the lands. It's problem is more related to the fact that it essentially has no freebore but it is a very sloppy chamber. With the slop and the lead angle it ends up allowing a 215 Berger to be seated out quite a bit. That is not something you can fix with a throater. I am not going to say you would see zero benefit but I am not sure I would mess with it. Having said that if I were building a 300 WM I would use a custom reamer for sure. The 10 twist I feel is optimal.
 

Ladd

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Have you or others used this reamer on a Ridgeline in 300 Win Mag to optimize seating depth for 215 Bergers ?
If so, what improvement did you see over the factory SAAMI chamber and is their standard 1:10" twist adequate for the 215s in higher humidity near sea level?
I think the 215 gr Berger Hybrid in the Ridgeline sits really good. I can load them in my Ridgeline to the lands if I wanted to and still be seated in the neck about perfectly. See this post. I suppose you could get a few thou more out of the throat. https://www.longrangeonly.com/forum/threads/300-win-mag-215-gr-berger-n570.6809/post-55278

I would consider extending the throat if I wanted to run something like the 245 gr Berger EOL.
 

JasonCO

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Good stuff here! I'v got a a short throated 6.5X284 Norma and a 28 Nosler that I'l be doing now, thanks!
 

Anderson1394

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What is the difference in strait vs helical thoater In practical terms of use. In what instance would you use one over the other? Thanks Adam
 

rfurman24

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What is the difference in strait vs helical thoater In practical terms of use. In what instance would you use one over the other? Thanks Adam
I am no machinist but generally speaking the straight should give better cuts and the spiral will remove chips better. If you are doing this by hand I don't think the chips will build up enough or quick enough to warrant the spiral.
 

Ladd

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I just finished doing this to my Christensen Arms Ridgeline 7mm. The process was straight forward and easier with this video to go back to if needed.

It turned out great and I can’t wait to work on a pressure test with the 190 gr Berger Hybrid. One nice thing to mention is there is plenty of room in this rifle’s mag box to load from the box even with the 190s seated to the lands.

Here’s a few pics.

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369fb1c139b32d4378358c982365d445.jpg



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Ladd

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Looks like I ended up extending the throat 0.141-inches. Easy peasy. I’m not sure what that makes the throat’s length now but I’ll research that latter. It looks good to me.

I loaded several rounds with N565 and H1000 last night for some pressure testing, see what it gets me with the 190 gr Berger LRHT. I’ll stop posting here, maybe start another soon.


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blvette75

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After reading this forum and watching multiple videos I have a question or two, if you have a 300 win mag with a 1:8 twist and use the uni-throat is there an advantage of a 300 PRC over the 300 win mag? This seems true even if you wanted to shoot 240 grain or 250 grain bullets or am I missing something? Sounds like would have to open up the mag length a bit as well. Just wondering since have all of the competition dies for the win mag.
 

Ladd

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I think if you wanted to shoot the 245 in a 300 win mag taking full advantage of the length of the 245 you would benefit from a longer throat. Otherwise the 245 would be deep in the case.

I have a thread for loading the Hornady 230 Atip in the 300 win mag and the 300 PRC and that was what I noted. You would think the PRC has the advantage loading longer heavier bullets but it didn’t translate into more velocity than the win mag.


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.270

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I just received my 300 wsm back from the gunsmith for being chambered and I didn't think about throating it for the bullet I want to use. The berger 200.2x are jammed at 3.087 while the xm action allows for the 3.2 coal. Should I see if the gunsmith can extend the throat or just do it my self with the uni throater? I see 4D rental has them for rent.
 

rfurman24

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I just received my 300 wsm back from the gunsmith for being chambered and I didn't think about throating it for the bullet I want to use. The berger 200.2x are jammed at 3.087 while the xm action allows for the 3.2 coal. Should I see if the gunsmith can extend the throat or just do it my self with the uni throater? I see 4D rental has them for rent.
I would have the Smith do it.
 

Gasman

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@rfurman24 Seeing as the sliding bushings normally come with a 30 degree shoulder angle, how important do you think it is to get custom bushings for cartridges that have a 35 or 40 degree shoulder? PT&G wants $85 for a custom sliding bushing at this time. TIA.
 

rfurman24

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@rfurman24 Seeing as the sliding bushings normally come with a 30 degree shoulder angle, how important do you think it is to get custom bushings for cartridges that have a 35 or 40 degree shoulder? PT&G wants $85 for a custom sliding bushing at this time. TIA.
I can't speak to that with experience but I do believe it would be better. Could you see the difference? I don't know.
 

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Long time viewer of this forum, recently decided to join and first post here. Just wanted to add my positive first hand experience with this tool.

I have a factory X-bolt 280 Rem which came with a very short SAAMI throat. Even though the factory detachable magazine allows up to ~3.6" OAL the short factory throat was forcing me to seat 160-175 grain bullets much further into the case than I liked and eating up precious powder capacity.

So last winter I rented a 7mm throat reamer from 4D Rentals and after a bunch of math & measuring bullets decided to push out the lands by 150 thou. Based on my figuring, I've gained about the same amount of functional case capacity as the 280AI would gain over the standard 280, just by being able to seat everything out further. Last weekend I was finally able to run some pressure ladder test loads over the Chrono and I'm tracking almost exactly with the 280 AI load data that Nosler publishes on their website. To say I'm thrilled with this mod is an understatement. Ackley Improved performance without having to fireform, only takes about an hour of effort (measure twice, cut once!) all without having to send out to a gunsmith.

 

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