338 r.u.m. 300gr otm 2970fps!!!

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by mcharger440, Apr 2, 2013.

  1. mcharger440

    mcharger440 Well-Known Member

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    just thought I'd share this little recipe with you guys I have a Remington 700 bdl (engraved) with a 1.20 strait taper shilen 1:9 rachet rifle barrel 31" long chambered in 338 ultra mag I had it throated to 4.088 Col shooting 92gr of retumbo with Berger otm 300gr bullets 55deg out at 1100ft 1-2965 2-2977 3-2980, 4-2968, 5-2972 .75ish group @ 200yds the bergers are .010 off lands ...all rem brass was easy reloadable no primer streching to speak of zero pressure signs...so pumped
     
  2. D.Camilleri

    D.Camilleri Well-Known Member

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    Nice! My 300 gr otms are going 2830 corrected out of a 27.5 broughton 5c with 90 grs of H-1000
     

  3. yama49

    yama49 Well-Known Member

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    Sounds fast, but nice vel, and group..
     
  4. mcharger440

    mcharger440 Well-Known Member

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    that's what I thought I was expecting 2800 and I don't know when it happens bit the elite hunters leave jackets about 150 yards and I mean I found 3 out of 5 jackets within 10-15 feet of eachother
     
  5. Broz

    Broz Well-Known Member

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    That's smoking, what chronograph and what altitude?

    I just finished load work up on a 338 EDGE with a 29 3/4" hart 1 in 10 barrel. I got 2837 fps average with 92.5 gr of H-1000 and a CCI 250's with the 300 OTM's.

    This was from an Oehler 35 chronograph 18' from the muzzle and 4100' ASL

    Thanks'
    Jeff
     
  6. Broz

    Broz Well-Known Member

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    This is sounding like what some were seeing with the with the Gen 1's when using tight twist tubes and velocity over 2850.

    How deep is your rifling scribing the jackets? Is it by chance a 3 grove?

    Jeff
     
  7. mcharger440

    mcharger440 Well-Known Member

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    as far as the rifling depth goes in not sure but I can clearly see it and it is a 4 groove.. The chronograph is a chrony on a bright sunny day at 1100 ft
     
  8. mcharger440

    mcharger440 Well-Known Member

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    also chronoghaph at 10 yards
     
  9. Broz

    Broz Well-Known Member

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    Well, I will cast an opinion for what it's worth. I think you have created a perfect storm. High velocity, 4 grove with deep scribing and a fast twist rate. The bullets are damaged in the tube from all this. I would recommend you go to the 300 OTM's. Their jacket is a little thicker and I think they will serve you much better.

    Jeff
     
  10. Korhil78

    Korhil78 Well-Known Member

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    I think that he is using the OTMs. So he is out of luck on that unless he slows them down although that might not help either.
     
  11. mcharger440

    mcharger440 Well-Known Member

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    I am using otm's they do ok its just the elites that give me problems
     
  12. Broz

    Broz Well-Known Member

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    That velocity of 2970 is at least 100 FPS faster than I would expect out of your load. It will be interesting to see how that works with drops when you take it to 800 plus.

    Jeff
     
  13. mcharger440

    mcharger440 Well-Known Member

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    I should have my stock done in 3-4 weeks and I'll let you guys know on the drop I've got a 1700 yd range in my back yard