300 ultra case damage

Discussion in 'Reloading' started by 300ultramag, May 26, 2006.

  1. 300ultramag

    300ultramag New Member

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    I am wondering if anyone would know what happened.I fired
    a round with 86 grains of Retumbo,200 Accubond,Fed215m primer COL at 3.595" Fired like any other round except that
    when i removed the case there was a 1/16 dia hole just below the shoulder.I have never used this powder before and I did not fire anymore until i find out what happened. The brass i used was shot maybe 3 times prev. with different loads. Suggestions??
     
  2. bailey1474

    bailey1474 <strong>SPONSOR</strong>

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    My guess would be a bad case. Just chunk it and go on. I'm shooting 85 gr Retumbo under a 240 SMK so I don't think your over pressure.
     

  3. Eaglet

    Eaglet Well-Known Member

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    Agree with Bill Bailey, I'm using 92 grains of Retumbo with Berger 210 gr. bullet. MV = 3025 ft/s.
     
  4. Guest

    Guest Guest

    I also agree with Bill as I'm using 85grs of Retumbo with the 240 SMK too, 2855 fps out of a 29" Lilja.
    Wayne aka WAMBO
     
  5. bailey1474

    bailey1474 <strong>SPONSOR</strong>

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    [ QUOTE ]
    I also agree with Bill as I'm using 85grs of Retumbo with the 240 SMK too, 2855 fps out of a 29" Lilja.

    [/ QUOTE ]

    That sounds exactly like my setup!! I believe my bbl is just a smidge shy of 30" though. Getting the same velocity.
     
  6. arthurj

    arthurj Well-Known Member

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    That load sounds like its a little on the lighter side. 85 grains under a 240 is a lot different than 86 with a 200 acc. 86 with the 200 should be on the bottom end. My thought is under pressure. I've had a 7rum and a 300 rum, sometimes with light loads they would dent right on the edge of the shoulder. Never had a hole though. The gases pass down the side of the neck before it seals the chamber.
     
  7. 300ultramag

    300ultramag New Member

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    The reason for the 86 is the loads on the internet i seen started at 89.5 thought i would work up to. I dont have the Reloading manual for that powder. I guess i will try the other rounds and see what happens....
     
  8. Jon A

    Jon A Well-Known Member

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    Yeah, you're about 10 grains under max which isn't a good idea with such a slow powder. If you want a reduced load for some reason (less recoil, etc) use a faster powder like H1000. Otherwise add about 5 grains to your load at a minimum and work up from there.
     
  9. dbhostler

    dbhostler Well-Known Member

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    Had the same problem with my 300 RUM. Problem solved by adding more powder. You could also increase the neck tension, seat the bullet deaper maybe use a hotter primer. But first choice is more powder.
    db