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

ShtrRdy

Active member
Joined
Aug 5, 2015
Messages
464
Reaction score
67
Points
28
Location
High Plains
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

Member
Joined
Dec 16, 2017
Messages
30
Reaction score
1
Points
8
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

LRO Rifle and Gear Review Editor
Staff member
Joined
May 27, 2015
Messages
1,639
Reaction score
983
Points
113
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

Active member
Joined
Apr 3, 2020
Messages
101
Reaction score
71
Points
28
Location
Virginia
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

LRO Owner~Editor~Long Range Hunting Specilist
Joined
Apr 17, 2013
Messages
10,438
Reaction score
2,643
Points
113
Location
Foot of the Big Belt Mountains near Townsend MT.
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.
 
Last edited:

rfurman24

LRO Rifle and Gear Review Editor
Staff member
Joined
May 27, 2015
Messages
1,639
Reaction score
983
Points
113
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

Well-known member
Joined
Mar 17, 2019
Messages
2,573
Reaction score
2,056
Points
113
Location
St. George UT
Very informative video. I liked it. Makes me want to increase the throat of my 7mm Ridgeline.
 

hindmarsh

New member
Joined
Jan 10, 2020
Messages
1
Reaction score
2
Points
3
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

LRO Rifle and Gear Review Editor
Staff member
Joined
May 27, 2015
Messages
1,639
Reaction score
983
Points
113
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

Active member
Joined
Nov 28, 2019
Messages
146
Reaction score
141
Points
43
Location
central Pa
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

LRO Rifle and Gear Review Editor
Staff member
Joined
May 27, 2015
Messages
1,639
Reaction score
983
Points
113
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

LRO Owner~Editor~Long Range Hunting Specilist
Joined
Apr 17, 2013
Messages
10,438
Reaction score
2,643
Points
113
Location
Foot of the Big Belt Mountains near Townsend MT.
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

Well-known member
Joined
Mar 17, 2019
Messages
2,573
Reaction score
2,056
Points
113
Location
St. George UT
The audio was good on my iPhone and laptop. No issues here.


Sent from my iPhone using Tapatalk
 

rfurman24

LRO Rifle and Gear Review Editor
Staff member
Joined
May 27, 2015
Messages
1,639
Reaction score
983
Points
113
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

New member
Joined
Apr 4, 2020
Messages
2
Reaction score
1
Points
3
Shooting the earlier 2950 fps loads yielded a 60 fps loss; have you been able to test some "hotter loads" yet??? Thanks.
 

rfurman24

LRO Rifle and Gear Review Editor
Staff member
Joined
May 27, 2015
Messages
1,639
Reaction score
983
Points
113
We are in the middle of load development with the new chamber.
 

mindcrime

New member
Joined
Apr 4, 2020
Messages
2
Reaction score
1
Points
3
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

LRO Rifle and Gear Review Editor
Staff member
Joined
May 27, 2015
Messages
1,639
Reaction score
983
Points
113
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.
 

PAXMAN

Active member
Joined
Dec 25, 2018
Messages
129
Reaction score
64
Points
28
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?
 

rfurman24

LRO Rifle and Gear Review Editor
Staff member
Joined
May 27, 2015
Messages
1,639
Reaction score
983
Points
113
What did you use for lubricant while you were making you cuts?
I used break free because it’s what I had. I feel any oil would work.
 

Merlin

New member
Joined
Aug 13, 2013
Messages
7
Reaction score
0
Points
1
Location
Western PA
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

LRO Rifle and Gear Review Editor
Staff member
Joined
May 27, 2015
Messages
1,639
Reaction score
983
Points
113
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

Active member
Joined
Nov 28, 2019
Messages
146
Reaction score
141
Points
43
Location
central Pa
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 .
 

GDP

New member
Joined
Apr 15, 2020
Messages
1
Reaction score
1
Points
3
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
 

Singleshot

New member
Joined
Nov 30, 2017
Messages
6
Reaction score
0
Points
1
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

LRO Rifle and Gear Review Editor
Staff member
Joined
May 27, 2015
Messages
1,639
Reaction score
983
Points
113
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

Well-known member
Joined
Mar 17, 2019
Messages
2,573
Reaction score
2,056
Points
113
Location
St. George UT
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

New member
Joined
Nov 12, 2017
Messages
4
Reaction score
1
Points
3
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

Member
Joined
Jul 21, 2020
Messages
37
Reaction score
8
Points
8
Location
Winnemucca,Nevada
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

LRO Rifle and Gear Review Editor
Staff member
Joined
May 27, 2015
Messages
1,639
Reaction score
983
Points
113
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

Well-known member
Joined
Mar 17, 2019
Messages
2,573
Reaction score
2,056
Points
113
Location
St. George UT
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.






Sent from my iPhone using Tapatalk
 

Ladd

Well-known member
Joined
Mar 17, 2019
Messages
2,573
Reaction score
2,056
Points
113
Location
St. George UT
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.


Sent from my iPhone using Tapatalk
 

blvette75

New member
Joined
Nov 24, 2020
Messages
4
Reaction score
3
Points
3
Location
Longmont, Colorado
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

Well-known member
Joined
Mar 17, 2019
Messages
2,573
Reaction score
2,056
Points
113
Location
St. George UT
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.


Sent from my iPhone using Tapatalk

 

Forum Sponsors

Top