Savage Target Crown

Discussion in 'Gunsmithing' started by Jinx-), May 18, 2011.

  1. Jinx-)

    Jinx-) Well-Known Member

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    What's so special about this muzzle crown is this best target crown for accuracy?

    [​IMG]


    [​IMG]

    By the way how's barrel looking, anything I should be concern about?
     

  2. J E Custom

    J E Custom Well-Known Member

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    There are many good crowns and there is nothing special about this one because it looks like
    a recessed 11o crown. In fact it looks like it needs to be re done because the edge of the bore
    is not sharp and it looks rough.

    Any good crown is uniform and clean and even if one does a "Bench rest" crown and it is not
    done correctly It will hurt accuracy.

    The only other thing that I see that is not desirable it the tool marks in the groves(Chatter)
    that run perpendicular to the bullet travel. This condition can cause early fouling and should
    have been lapped out or rejected.

    Sorry for the not so good news.

    I am sure that someone can post a realy nicely done crown (I Can't) for your reference.

    J E CUSTOM
     

  3. Jinx-)

    Jinx-) Well-Known Member

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    Thank you J E CUSTOM , I was wondering why it fouls so heavily, and I get unexplained fliers. I think this one need to go back to the factory, oh well I had so much hope for this stick...
     
  4. rscott5028

    rscott5028 Well-Known Member

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    I don't have a macro lens. So, I can't share a nice photo. But, my Savage 12F 6.5x284 has a lot of rounds down it and the bore as well as the crown look a lot cleaner and sharper without the tool marks that JE noted.

    What model Savage is yours and how many rounds?

    -- richard
     
  5. Jinx-)

    Jinx-) Well-Known Member

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    Richard that's new Long Range Precision model 12 Target in 260 Rem 1:8 twist and very short freebore, seating 140 gr Nosler CC makes 2.760" MAX, maybe I purchased totally rejected rifle, but how distributer got hold of them??? I only had 80 rounds down, one session 40 and another 40, I did 5 shot clean, the last 20 I fired with no cleaning took me like 1.5 hours to get copper out with KG-12 and brush.
     
  6. rscott5028

    rscott5028 Well-Known Member

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    I'm not sure where Savage draws the line. But, I doubt it was a factory reject.

    How well is it shooting for you?

    -- richard
     
  7. Jinx-)

    Jinx-) Well-Known Member

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    here is last group 5 shots from those 20 I fired at 300 yards it shoots better out of clean barrel but on shot # 7-8 I start to get fliers.

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    Here is 100 yard group clean barrel, notice POI moves upward to the left:

    [​IMG]

    Next 5 shots POI stays the same for another 2 shots then its allover:

    [​IMG]
     
    Last edited: May 19, 2011
  8. Boss Hoss

    Boss Hoss Well-Known Member

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    When looking through a bore scope all factory rifling is ugly but that does not mean they will not shoot. That crown needs some work---not good.

    The flyers are most likely because of bedding issues and as latent stress makes itself apparent as the steel heats up. This is just something to accept with a factory barrel unless you let it cool between shots with respect to the stress issue.
     
    Last edited: May 19, 2011
  9. Trickymissfit

    Trickymissfit Well-Known Member

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    I don't think that group size is from the crown, but will agree that it needs to be redone. Groups look like something is moving during recoil. Whatkind of bases and rings are you using, and did you bed the base (s)? I'd hunt up a good 1/4" drive inch pound torque wrench that falls into the 25 to 60 inch pound bracket (around zero to seventy-five inch pounds). Torque the bedding screws to about 35 in.lb., and try that to see if it helps. If it dosn't, then torque them again to 40 in.lb. Then once again try it at 45in.lb.

    Back to the barrel: I hope you are not useing metal brushes! Have a good one piece cleaning rod with a guide. I like the stainless steel Pro Shot rods pushed thru a tight fitting guide from the chamber. I don't personally like coated rods, but others think differently I know. More crowns are messed up from cleaning than anything else. Never try to pull a jag or brush back thru the crown.

    Take a good serious look at the barrel with a good tight fitting jag & patch. Coat it with light oil, and push it thru the barrel making note of the tight and loose spots. If the barrel is tight all the way till the last three or four inches you have a problem. But if the barrel is nice and smooth till the last four inches, and get's tight you have a good barrel to work with. If it's pretty much the same all the way, I'd be looking at lapping the barrel. Maybe a few bullets coated with 5a lapping compound might help here.
    gary
     
  10. Jinx-)

    Jinx-) Well-Known Member

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    This rifle comes with HS Precision stock, I do agree I need to get it skin bedded, right now it has Weaver 20 MOA rail I didn't do any bedding on it, I took scope with rings from my 308, it has Weaver rough looking 4 screw medium rings, never had problem with that thing moving. The action screw, the front one I set to 35 inch/lb rear is set to 30. About Weaver rail, before that I had 2 piece standard Weaver rails, they produced same result. What I noticed there are aluminum lines from bedding block printed on the sides of the action, after I get it skin bedded they should go away.
     
  11. hammertyme

    hammertyme Well-Known Member

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    Jinx

    A number of years ago I sent a unfired 338 barrel to Savage that looked like your barrel. I knew it was going to foul bad. They told me there was nothing wrong with the barrel and to quit using a bore scope. I refused to resell the barrel and I refused to shoot the barrel until after I sent it to Benchmark and asked the guys to clean it up.
    They pinned the barrel and the pin would not drop through the barrel. $35. for lapping and I have avery fine shooting barrel.
    That crown is bad.

    Neal
     
  12. Jinx-)

    Jinx-) Well-Known Member

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    The barrel in this picture has hand lapping performed not to abrasive just some KG-2 (1200 grit), so it is not as bad, I haven't try it yet so it might not have as much fouling as I experienced previously.
     
    Last edited: May 19, 2011
  13. Jinx-)

    Jinx-) Well-Known Member

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    I doubt anything moving because of the recoil, since after I clean it repeats same pattern. However I took my other rifle Rem 700 in B&C medalist stock and I played with torque on action screws, having front to 35 inch/pound and back to 30 I had fliers all over, but when I set front to 50 and back to 40 the accuracy return to 0.36" 5 shots.

    I think I'll make few loads and test drive Savage with torque wrench.

    About cleaning, I don't have any metal brushes I only use nylon from Boretech, jags are also from Boretech. For cleaning rod I use Tipton carbon fiber cleaning rod and bore guide, never insert anything without one, any time brush comes out from muzzle end I remove brush, the jags are different after patch is removed, I do not remove jag, just pull rod with it.
     
    Last edited: May 26, 2011
  14. freeflight

    freeflight Active Member

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    yucks´╝îgotta check the crown on my 12LRP