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 Post subject: throating , the one I couldn't pass up part 2
PostPosted: Fri Feb 01, 2019 6:43 pm 

Joined: Tue Aug 16, 2011 2:13 pm
Posts: 1579
Location: center of Pa
here is part 1 on this rifle .
viewtopic.php?f=9&t=32610


I received the throating reamer from 4D Wednesday . I was disgusted when I got it , I thought I would get the "T" handle to turn the reamer since it's pictured with the set on 4D's website , but I didn't . so I thought about it and went to the hardware store and bought a bolt and a few nuts that fit the reamer #12 x 24 machine screw . with this hex nut on the screw I can run the reamer with a socket . the alignment sleeve seems to keep things centered up pretty good . I do know that the targets will tell the true story , and this rifle did shoot good before . I'm probably nuts for doing this . I bought a bunch of different bullets to use for measuring . I want to reach the lands , and not exceed the mag box length . the rifle will be primarily a hunting rifle so I'm more interested in how the hunting bullets work out . if I decide to use the long slick VLD type bullets I can single load them if I need to . I lengthened the throat a fair amount , and things seemed to work out well from what I can tell without shooting it . I have measurements off the bullet tips and also off the ogive I used both while I did this . I would keep loading a few different bullets and keep making them longer as I cut the throat , so I could watch my progress . I'm glad I did this the different style bullets changed at different amounts as I cut . it would have been a lot easier to just throat it for one bullet , but I didn't want to pin myself down to just one bullet . I wanted a happy medium that would work for many bullets . I'll post some bullet lengths and put up a few pics .

length off the bullet tip to touch lands.

bullet ........................ before length .........................after length
140 B-tip ....................2.779 ..................................2.933
120 B-tip ....................2.780...................................2.933
130 A-bond..................2.799...................................2.954
Horn 129 SP.................2.741...................................2.813
125 partition ...............2.770...................................2.905
129 ABLR ...................2.893....................................3.012
143 ELD x...................2.882....................................3.044
140 berger VLD h.... ....2.888....................................3.044

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File comment: tool with machine screw
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File comment: reamer ready to use
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File comment: rifle ready to cut
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File comment: stripped the bolt of firing pin and ejector for better feel of touching the lands
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File comment: hooked case under extractor for checking length to lands
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File comment: before and after pics of the bullets
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more pics coming .


Last edited by jimbires on Fri Feb 01, 2019 7:03 pm, edited 1 time in total.

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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Fri Feb 01, 2019 6:51 pm 

Joined: Tue Aug 16, 2011 2:13 pm
Posts: 1579
Location: center of Pa
Attachment:
File comment: can see the lands and the carbon ring at the case mouth
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File comment: partially cut , can see carbon ring and fresh cut
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File comment: cut a little more . can still see both in pic
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File comment: cut is finished . edge of land
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File comment: gap between lands and carbon ring
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Attachment:
File comment: carbon ring at case mouth . can't see lands
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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Fri Feb 01, 2019 7:13 pm 

Joined: Tue Mar 28, 2017 7:27 am
Posts: 444
Nicely done and you have the makings of a bush Alaskan with that handle improv!


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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Sat Feb 02, 2019 3:27 am 

Joined: Tue Aug 16, 2011 2:13 pm
Posts: 1579
Location: center of Pa
thanks gbflyer , it looks good to me , but I'm anxious to get it out and shoot it to see how it does . it looks like the weather is going to turn mild for a few days , maybe I can get it out .


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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Sat Feb 02, 2019 7:47 am 

Joined: Sun Dec 24, 2006 12:20 pm
Posts: 29309
Location: Northern Virginia
Looks great Jim. Can’t wait to see how it shoots.

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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Sat Feb 02, 2019 11:00 am 

Joined: Tue Mar 28, 2017 7:27 am
Posts: 444
I’m no expert on peering with a bore scope but to me that looks quite smooth. I’ve taken to what I call a “pre-break in” on the throat area with the chambers I’ve been reaming by carefully polishing the throat area with JB Bore on a patch wrapped bore brush while still in the lathe. Only the throat. I borrowed this from one of the real gunsmiths that is willing to share publicly. I think it helps the throat not copper up as much with the initial couple of shots.

The point of my sharing this is that your barrel might want to foul for a bit after the fresh throating job. Or that baby might just go along like nothing ever happened.


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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Sat Feb 02, 2019 6:15 pm 

Joined: Tue Aug 16, 2011 2:13 pm
Posts: 1579
Location: center of Pa
SJB358 wrote:
Looks great Jim. Can’t wait to see how it shoots.




I'm anxious too . I have a ladder loaded up and a few 3 round groups to check seating .


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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Sat Feb 02, 2019 6:20 pm 

Joined: Tue Aug 16, 2011 2:13 pm
Posts: 1579
Location: center of Pa
gbflyer wrote:
I’m no expert on peering with a bore scope but to me that looks quite smooth. I’ve taken to what I call a “pre-break in” on the throat area with the chambers I’ve been reaming by carefully polishing the throat area with JB Bore on a patch wrapped bore brush while still in the lathe. Only the throat. I borrowed this from one of the real gunsmiths that is willing to share publicly. I think it helps the throat not copper up as much with the initial couple of shots.

The point of my sharing this is that your barrel might want to foul for a bit after the fresh throating job. Or that baby might just go along like nothing ever happened.




it does look to be a pretty smooth finish .looks to be a fair amount smoother than the original . I'll keep the JB's tip in mind . I've heard of guys JB-polishing the throats as a maintenance . I've never done this . thanks for the tip .


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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Mon Feb 04, 2019 6:05 pm 

Joined: Tue Aug 16, 2011 2:13 pm
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Location: center of Pa
I put a few rounds through the rifle yesterday . it is producing great velocity and didn't copper up much at all . I have a 3 round group about an inch at 100 yards, man am I rusty . I need to start loading 4 or 5 to be able to get 3 good ones on target .the range was busy , I didn't get to walk out and number my ladder shots . I really just wanted to get some rounds through it , and check for copper and velocity . it looks like things are going to work out .

Attachment:
File comment: original throat after 8 shots
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File comment: new throat after 33 shots . there is a fuzzer on the bore scope
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Attachment:
File comment: 125 gr partition , RL17 powder
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File comment: 44.5 gr RL 17 , .010 jump , 125 partition ,2930 FPS
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Attachment:
File comment: 11 shot ladder at 100 yards , powder 42.4 - 47.5
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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Mon Feb 04, 2019 6:49 pm 

Joined: Tue Mar 28, 2017 7:27 am
Posts: 444
Wow that new throat is clean. Nice work!


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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Mon Feb 04, 2019 7:36 pm 

Joined: Sun Dec 24, 2006 12:20 pm
Posts: 29309
Location: Northern Virginia
That’s some great speed. 46/46.5 look might close on speed. That’s hoofing for a 260... darned thing thinks it’s a 270.

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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Tue Feb 05, 2019 4:14 am 

Joined: Tue Aug 16, 2011 2:13 pm
Posts: 1579
Location: center of Pa
thanks guys . I didn't show pressure yet , but according to quickload this is over max by 1 or 1.5 grains . the velocity is also plenty fast . I thought I'd be working with the 120 - 130 class bullets for decent velocity , but I'm thinking a 140 B-tip should still be in the 2900 - 2950 FPS range . that's fast enough to keep me interested . I'm anxious to get working up a load watching accuracy now .


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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Sat Jun 22, 2019 1:30 pm 

Joined: Tue Aug 16, 2011 2:13 pm
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Location: center of Pa
I haven't been shooting much at all this year , helping my son with some home remodeling . I'm rusty and I caught a cold . shakes and jitters , you bet I am . I took it out again today . I was testing seating at a minimum powder charge . quickload looks to be 42.8 min at 2850 FPS . I've done this before and there was always a group that was noticeably better than the others , this time things are not so easy to read . a couple of these groups look like I could start increasing the powder charge and see how it shoots . I have a couple groups marked 1 pulled , I actually touched it off before I was ready . I have a hard time shooting from the bench with my bag set up . it seems I don't have room for my trigger hand unless I have it all twisted around trying to fit in there . gotta be something better out there for me . all that said , the rifle looks like it'll shoot .


this is at 100 yards .

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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Sun Jun 23, 2019 9:33 am 

Joined: Mon Mar 06, 2017 8:50 am
Posts: 1022
Interesting project Jim and always good to see improvements. Looks like a job well done to me.


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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Sun Jun 23, 2019 4:15 pm 

Joined: Tue Aug 16, 2011 2:13 pm
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Location: center of Pa
thanks Shade Tree . I got some ammo loaded today , I'm anxious to get it out again .


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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Sat Jun 29, 2019 8:06 am 

Joined: Tue Aug 16, 2011 2:13 pm
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Location: center of Pa
got out again today . the rifle shoots well . I'm very pleased . here's a couple of targets from today . I'm starting to see why you guys like the 260 rem's .

final load with the 125 gr partition . I think all the info is on the target , if not I'll add it . the lower shot was a cold , clean bore .

3 shots from 100 yards .

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started a seating depth test with the 140 B-tips with a starting load of RL26 . I felt sloppy on the .010 jump and the .015 jump targets . I think I'll shoot them again . the .005 jump is 3 shots , the others are 4 .

from 100 yards .

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P6290094.JPG [ 704.42 KiB | Viewed 780 times ]


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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Fri Jul 12, 2019 3:30 am 

Joined: Tue Aug 16, 2011 2:13 pm
Posts: 1579
Location: center of Pa
got out yesterday after work . the rifle seems to shoot well with anything I try . I had a seating depth test loaded up at jumps of .010 , .050 , .090 , .130 . but after I shot 3 rounds to foul the clean bbl at .035 jump I decided I need to work in around that area . all shot from 100 yards .


cold clean bbl , .035 jump , new brass .

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.010 jump

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.050 jump .

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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Fri Jul 12, 2019 7:42 am 

Joined: Sat Feb 13, 2016 10:16 am
Posts: 1235
Nice shooting Jim, have you taken it out to a further distance and see what different seating depths will show?
The ABLR bullet had been fussy in my 7mm Mag and I gave up on it. Good to see it worked good for ya.

And for the Partition, its a solid hunting load as the picture shows. (y)

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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Sun Jul 14, 2019 7:54 am 

Joined: Tue May 01, 2007 9:05 am
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Nice work. I have always though the .260 Rem is way Underestimated !


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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Mon Jul 15, 2019 2:50 am 

Joined: Tue Aug 16, 2011 2:13 pm
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Location: center of Pa
thanks guys , I'm really liking this rifle . it shoots everything pretty good , that I've tried so far . fast and accurate , what more could a guy ask for . Mark , I haven't tried it out at longer distances , I have to get the powder charge nailed down before I shoot it far .


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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Sun Sep 08, 2019 8:36 am 

Joined: Tue Aug 16, 2011 2:13 pm
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Location: center of Pa
I've had a couple guys contact me on this rifle . I thought I'd just post the info here . the rifle continues to please me . it shoots everything well that I tried so far .

today I worked with the 140 B-tips again . I thought I had it nailed down and this seems to prove it . 5 shots from 100 yards . good velocity . 2909 , 2906 , 2901 , 2907 , 2921 . .005 bullet jump , RL26 48.8 gr
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I made a windage adjustment , added 12.5 min of elevation . 6 shots from 600 yards .

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I shot a velocity ladder with the 129 ABLR bullets using my previously found seating depth . this is the bullet I'll work with next next . shot from 100 yards .

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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Sun Sep 08, 2019 8:48 am 

Joined: Wed Nov 08, 2006 2:49 pm
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Location: Northern British Columbia
You have every reason to be pleased with that rifle/load. You're handling it as it was meant to be used. Good job.

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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Sun Sep 08, 2019 9:10 am 
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Location: British Columbia
Just went through this thread and the first one you posted at the top, thanks for taking us through the whole process. The rifle is really nice and the 260 Rem is too especially when you can load them out to around 3.00" or so.

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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Sun Sep 08, 2019 4:29 pm 

Joined: Tue Aug 16, 2011 2:13 pm
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Location: center of Pa
thanks fellas , I have a few good loads figured out and I'm going to work with a few more bullets and see how it does with them . it has really been an easy rifle to work with .


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 Post subject: Re: throating , the one I couldn't pass up part 2
PostPosted: Wed Sep 11, 2019 7:52 am 

Joined: Sun Nov 04, 2007 7:27 am
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Location: Regina, Saskatchewan Canada
Hmm the 260 in these parts is not very common but it has always tweaked my interests.
Great job!

Blessings,
Dan

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