New Precision Rifle in the house!-New pics on post #52!

Still waiting for a picture of the recessed crown. Your Rifle looks very nice. I am loading 48gr of h4831sc in my 260 with 142 gr. matchkings. The bullets are sitting .001" off of the lands. I am using Nosler brass though. One day I'll move into the Lapua brass.
 
Crashman said:
I am loading 46 grains of H4831SC with the 139 Scenars in Lapua brass to an OAL of 2.820". I can really feel the powder compressing when I seat the bullet. I am going to do some research and see if there is another powder that will give me good load density and velocity and need to be so compressed.
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Wow that is pretty short for the L139s. Are they at this length because you need/want to feed from the magazine, or is this where your throat puts them?

You might want to consider lengthening the throat in your .260 Rem as one possible solution (assuming you don't need to feed from the mag). I ended up lengthening the throat in my 6.5-08 so that I could set the L139s and S142s at a sensible length (I was single loading them so there were no magazine considerations for me).
 
rnbra-shooter said:
Wow that is pretty short for the L139s. Are they at this length because you need/want to feed from the magazine, or is this where your throat puts them?

You might want to consider lengthening the throat in your .260 Rem as one possible solution (assuming you don't need to feed from the mag). I ended up lengthening the throat in my 6.5-08 so that I could set the L139s and S142s at a sensible length (I was single loading them so there were no magazine considerations for me).
Click to expand...


Hi,

I have the same issue, this is why I asked him what is his OAL. My custom is single shot so I've set the OAL to touch the rifles. I get exactly 2.820" OAL when measure with the Hornady gauge to touch the land. I guess our chamber was done with the same reamer from Sean. I'm also using Lapua brass.

Thanks
 
I have the rifle set up that way so it will feed from the magazine. I plan on using the rifle for a few matches next summer that apparently requires the shooter to make shots in quick succession so I thought I would be better off with a repeater.

At my COAL of 2.820", I am touching the lands...but just barely. The bolt is just marginally stiff to close, barely enough to notice.

Sorry, I forgot about the picture request for the recessed crown. I do not know what the standard is, but this is how mine was done...

DSC_0219.jpg


DSC_0218.jpg
 
Crashman said:
I have the rifle set up that way so it will feed from the magazine. I plan on using the rifle for a few matches next summer that apparently requires the shooter to make shots in quick succession so I thought I would be better off with a repeater.

At my COAL of 2.820", I am touching the lands...but just barely. The bolt is just marginally stiff to close, barely enough to notice.

Sorry, I forgot about the picture request for the recessed crown. I do not know what the standard is, but this is how mine was done...

DSC_0219.jpg


DSC_0218.jpg
Click to expand...

Not to offend, but you can`t shoot heavy bullets efficiently with a coal of 2.82. In a repeater set-up using an ai mag system, you could have a coal of up to 2.96" and the rifle should have been chambered and throated to suit. A custom rifle should be about accepting no comprimises, this is a huge comprimise and should have been pointed out to you during the build. You may be better off going to a much lighter bullet or switching out your bm and throating to utilize that mag space. The optimum powders for the 260 are 4350, rl17 and 4831sc. IMHO, 4831sc gives the best results as it seems to be insensitive to temperature changes and burns much cooler than the aforementioned powders. Like Jeromeo stated above that he is using 48gr of 4831, that is obviously impossible with a coal of 2.82".
 
Yes I read exactly what you are saying, and no you do not offend. The original plan was to just use the BDL bottom metal, but then I decided I would try some of these matches next summer so I am upgrading to the detachable mag system. If neccessary, I will have the barrel modified to accept max COAL according to my magazines. Thanks for pointing this out.
 
Crashman said:
Yes I read exactly what you are saying, and no you do not offend. The original plan was to just use the BDL bottom metal, but then I decided I would try some of these matches next summer so I am upgrading to the detachable mag system. If neccessary, I will have the barrel modified to accept max COAL according to my magazines. Thanks for pointing this out.
Click to expand...

A suggestion..?

- throat your rifle to accept long-loaded 140-class target bullets (Berger 140 VLD or BT, Lapua 139, Sierra 142 etc). For very long range slowfire, you can single-load and you'll be able to get every last bit of possible performance out of your .260.

- for the matches you need to fire from the magazine (presumably some sort of sniper course of fire?), find an accurate load using a jump-tolerant bullet (for example Sierra 142, Sierra 140, Sierra 123 or Sierra 107 Matchking) and shoot that from the magazine.
 
rnbra-shooter said:
A suggestion..?

- throat your rifle to accept long-loaded 140-class target bullets (Berger 140 VLD or BT, Lapua 139, Sierra 142 etc). For very long range slowfire, you can single-load and you'll be able to get every last bit of possible performance out of your .260.

- for the matches you need to fire from the magazine (presumably some sort of sniper course of fire?), find an accurate load using a jump-tolerant bullet (for example Sierra 142, Sierra 140, Sierra 123 or Sierra 107 Matchking) and shoot that from the magazine.
Click to expand...

Thanks for the suggestion Daniel, I already have some 123 Scenars but I have not tried them yet. That was going to be my next thing on the "to do" list!
 
rnbra-shooter said:
A suggestion..?

- throat your rifle to accept long-loaded 140-class target bullets (Berger 140 VLD or BT, Lapua 139, Sierra 142 etc). For very long range slowfire, you can single-load and you'll be able to get every last bit of possible performance out of your .260.
Click to expand...

Seems I 'm in the same situation and was expecting to load with a longer coal... Is this something complicated the get the rifle throat changed to accept a longer coal?

Thanks
 
Crash2k said:
Seems I 'm in the same situation and was expecting to load with a longer coal... Is this something complicated the get the rifle throat changed to accept a longer coal?

Thanks
Click to expand...

Not at all, no charge if you got the bbl from me, just pay postage.

Don't sell the 123 grain scenars short either...Ballistics are not all that far off although you will obviously give up some energy.


http://www.snipercentral.com/260.htm

Cheers
 
Wyatt Bottom Metal installed!

I have upgraded my mag system to a detachable mag and bottom metal from Wyatt. The bottom metal is machined aluminum with the mag release similar to a factory Remington found in the front of the trigger gaurd bow. The mags are metal, and seem to be very robust, however I do not have any experience with this type of mag system from any manufacturer so it is hard for me to comment on the quality in comparison to other brands available, but for a green horn, these mags seem to be of very high quality, and for what I want to do with the rifle I can forsee no problems at all. They are a centre feed design, with the rounds slightly staggered to the right and left once more rounds are pushed down on top. I got both a 5 round mag and a 10 round mag. I loaded both with ammo, and the spring tension is quite strong, they cycled very well in my rifle with out a hitch, and I tried both of them several times. I did however have to put a small spacer between the stock and the bottom metal at the rear action screw to get proper engagement of the mags to get them to click into place. I am going to experiment a bit more with this to see if there is a better solution.

The thing I like best about this system is the fact it is a drop in fit to my factory inletting on my HS stock. I mean there was no work required to get it to fit in the existing inletting. Other than needing a small spacer as described above, I would call it a perfect fit! I got this kit from Sean at North Shore Barrels, I believe he has several kits available so contact him if you are in need of a new mag system for your rifle!

Here are a few pics to see...

DSC_0222.jpg


DSC_0223.jpg


DSC_0224.jpg
 
That mag system looks great. How does putting your ammo in a magazine affect the accuracy of the ammo? With very little neck tension on match ammo, does the magazine distort the concentricity when being loaded into the magazine?
 
masonicshooter said:
That looks really good! What's the internal dimensions of the mag, max length?
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The 5 rounder is 2.883", and the 10 rounder is 2.889".

PrairieSniper said:
That mag system looks great. How does putting your ammo in a magazine affect the accuracy of the ammo? With very little neck tension on match ammo, does the magazine distort the concentricity when being loaded into the magazine?
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That is a question I can not answer as I do not have any way to check that at this point. Maybe sometime in the new year I will get a case concentricity gauge and I will let you know.
 
Latest Range Report

I made another trip to the range today. Weather conditions were brutal with a 20 kph wind out of the north, which at this range is directly in your face...:mad:, plus snow! The Wyatt bottom metal is impressive, it feeds reliably, ammo loads okay but my frozen fingers probably made the job more difficult than it should have been. I was shooting the 123 Lapua Scenars today and they show some real promise for accuracy. I only had 15 loaded rounds, but of the three 5 shot groups my average was right at 0.5" at 100 yards, and the velocity was 2950 fps for the loads where the bullet had to jump to the rifling, but the 5 rounds loaded with about 0.0010" jam the velocity spiked to 3040 fps. I don't think I will load them jammed into the rifling like that because they are too hard to close the bolt on, plus the accuracy was the same with the round loaded off the rifling.

Up next: action bedding job. I think that is the next major step to get this rifle to really settle down and shoot some consistent groups. I will let you know how I make out with that.

Merry Christmas!
 
Hey crashman...if you get a chance can you take a couple pics showing the whole rifle with mag in? I have 3 more sets of Wyatt metal coming in and I like the looks of it in your rifle. Need a pic for my ad.


Cheers
 
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