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338 EDGE build

Discussion in 'Gunsmithing & Repairs' started by PR-6284, Jun 20, 2019.

  1. PR-6284

    PR-6284 Sharpshooter

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    The action and base have both been modified to the larger 8-40 screws.

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    The bottom set of screws are the flat head screws that came with the .040 tapered steel base. The small set of screws allowed for only 4 1/2 threads of contact. The larger tapered 8-40 screws allow for 7 full threads on the back of the action and 6 on the front. The base manufacturer recommends 35 inch pounds of torque. By going to the larger screws with more thread contact, I can lock that base down with 4 screws at 85 inch pounds, and the customer can be assured that the scope base will NOT shoot loose!

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    I just finished making the muzzle brake for this build, and it is 1.00" in diameter with a thread size of 3/4-30.

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    Keith told me that I could use any barrel I wanted in this build, so I ordered a Bartlein .338 barrel 32" long, with a muzzle diameter of .950. The shipping notice I just received said the barrel should be here sometime this Thursday.

    Keith just told me that he has a used custom stock heading my way, so knowing him, it will either be strange or interesting or maybe both! More pictures to follow in another day or two.
     
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  2. DRC458

    DRC458 Sharpshooter

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    I'm trying not to drool. Carry on ...
     
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  3. dennishoddy

    dennishoddy Sharpshooter

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    The .930 barrel is going to be heavy.
    That being said, my 1:8 .243 WSSM has the same barrel diameter, and it's heavy at 22"
    Great work so far BTW.
     
  4. Snattlerake

    Snattlerake Sharpshooter

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    Never knew what a 338 EDGE was.

    His scope base has 208 MOA built in.
     
  5. PR-6284

    PR-6284 Sharpshooter

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    This is my first 338 EDGE build, but probably not my last!

    Keith is finishing up a 1,200 yard range, and this 338 EDGE will be the first rifle to be shot on it.
     
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  6. PR-6284

    PR-6284 Sharpshooter

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    I finally got in the barrel blank for this build.

    32" long / .950" at the muzzle at 32"

    Barrel weight is 7.88 pounds

    20190702_123635-1.jpeg

    While I am waiting to get in a couple of dummy rounds from Keith, so I can get this gun chambered and set up for near zero headspace, and throat length, I finished up work on this little 4 1/2 pound rifle. I rechambered it to the 30-30 Ackley Improved, and added one of my barrel extensions to make it legal as a rifle, since the barrel itself is a Super 14" Contender barrel. Overall barrel length is now 16 1/2".

    009-3.jpg

    I also rechambered 2 different guns from .22lr. to 22 magnum, and a Savage 223 barrel to 222 Remington Magnum Improved, as well as a 6.5 TCU rechambered to my 6.5 Armadillo cartridge, which is based on a maxed out 30-30 case. Oh yeay, there were 3 muzzle brakes installed along the way too. Whew.

    I'll update again after I receive the dummy rounds.
     
  7. PR-6284

    PR-6284 Sharpshooter

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    I finally got in a couple of dummy rounds from Keith, so I just finished setting the barrel up for chambering.

    A bore rod was inserted into both the chamber and muzzle, with .0000 play, meaning it was a very snug fit. After dialing in both ends, and then the outside of the barrel, once everything was set and ready for the chamber cutting to commence, the bore alignment runout on both ends was .0000 and if I do my part, the chamber will be cut perfectly concentric with the bore.

    The cartridge on the left is a 300 Winchester, and the one on the right is the 338 EDGE.

    The pilot on the reamer measures .3294 and sounds like a hydraulic cylinder going into the bore, as it is a very precise fit.

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    Last edited: Jul 9, 2019
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  8. PR-6284

    PR-6284 Sharpshooter

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    I decided to do a different set up with the barrel, and it's something I have contemplated doing for probably 20 years now, and even though the set up takes longer, I think it will be worthwhile. I took a 1 1/4" brass ring and cut away the brazed area on it, so as to allow for a light compression of it when fit around the barrel. This brass ring allows the barrel to to be adjusted coaxially between both the headstock and the brass tipped spider on the outboard end of the lathe. The small grooves of the chuck jaws keep the ring centered, and only light pressure is required to keep the barrel held securely in place.

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  9. PR-6284

    PR-6284 Sharpshooter

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    I finished cutting the chamber and put a light polish on it, which took all of 5 seconds with a piece of 600 grit polish cloth at 800 rpm.

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    Headspace will be set per the customer provided dummy rounds.

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    Next was to cut the bolt counterbore.

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  10. PR-6284

    PR-6284 Sharpshooter

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    After the work posted above was completed, I removed the 4 jaw chuck and put the barrel between centers for threading.

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