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338 Edge Need Help with Early Pressure Signs

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  #8  
Unread 08-10-2013, 08:34 PM
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Re: 338 Edge Need Help with Early Pressure Signs

Brass looks soft to me. But who knows. The face of the primer looks normally flat. But not excessive. Punch one out and see if it has straight sides or if it is muffin topped.

I will take that accuracy from a 338 especially a 5 shot group. 10-4 on the Bertram brass. You have the load and I bet it would only shoot better in fire formed Bertram EDGE brass.

Jeff
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  •   #9  
    Unread 08-11-2013, 11:53 AM
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    Re: 338 Edge Need Help with Early Pressure Signs

    Jeff,
    I have punched out several of the primers from the loads I just shot. I am seeing them slightly wider at the primer/bolt face than the middle of the primer by 3-4thou. The edge of the primer is still rounded.
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      #10  
    Unread 08-11-2013, 12:24 PM
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    Re: 338 Edge Need Help with Early Pressure Signs

    Quote:
    Originally Posted by nchunter182 View Post
    Jeff,
    I have punched out several of the primers from the loads I just shot. I am seeing them slightly wider at the primer/bolt face than the middle of the primer by 3-4thou. The edge of the primer is still rounded.
    Well, I think you are concluding you could have some soft brass. Realize I do not want to lead you into a dangerous situation. So please be careful as I am not there to see the results in person nor should I make this call for you from a distance. But 3 to 4 thousands is not a "muffin topped" primer to me, especially if it has rounded corners. I have seen them from max loads that when rolled on the bench top turned a tight circle. I called those an over pressure load. I think all you need is a cool chamber and some lower fall temps with this brass. Go to 3 shot groups at 200 yards to check this load. If you notice a 3rd shot having a heavier bolt lift I would back off to 2 shot groups and do more of them at longer distances.

    Jeff
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      #11  
    Unread 08-11-2013, 01:05 PM
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    Re: 338 Edge Need Help with Early Pressure Signs

    Jeff,
    That is what I'm concluding - I think the Nosler is just soft. No doubt this is a stout load though and caution will be taken. I'm not going to increase it any further but will do more testing to verify and back off if needed. Next time the chrono will be further out so I can verify my velocity readings.
    Thanks for you feedback!
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      #12  
    Unread 08-11-2013, 01:36 PM
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    Re: 338 Edge Need Help with Early Pressure Signs

    Correct me if I'm wrong, but I don't think COAL is as relevant as one might think. The shape of the bullet or ogive is what critical. The distance from bolt face to lands.

    Different ogive seated at the same COAL will have different CBTO thereby camouflaging the results and causes. ???
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      #13  
    Unread 08-11-2013, 01:59 PM
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    Re: 338 Edge Need Help with Early Pressure Signs

    Rusty,
    You are correct. Different bullets of the same length (even same type or lot#) will have differing lengths when measured from the cartridge base to the ogive. I always set my seating die based on readings using the Hornady Overall Length Gage with the bullet I intend to shoot.
    In this thread I've included the COAL just for reference. COAL does become very important when you are feeding through a magazine. My Edge has the Wyatt 4" box and I had the reamer built to allow me to take full advantage of this extra length.
    Jay
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      #14  
    Unread 08-11-2013, 04:06 PM
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    Re: 338 Edge Need Help with Early Pressure Signs

    OPh crap - I'm facing the same issue with a 660 Rem in a 6.5 Rem Mag. I'd like to kick the engineers butts that design a rifle with out facilitating a magazine that allows one to seat loads to the rifling instead of the magazine.
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