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210 bergers blowing up?? help 30-378 wby

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  #22  
Unread 05-21-2006, 09:42 PM
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Re: 210 bergers blowing up?? help 30-378 wby

I had 210 Bergers blow up in a 10 twist no freebore 300 Weatherby at 2930 in the middle of a match. The first two times was with between ten and 20 rounds through the chamber. I figured I must have hit a bird on the way to 1k when all ten didn't show up on the target. Then two matches later I had a guy spotting behind me during my relay and he saw round 9 come apart at around 100 yards. So I cleaned and put another 20 down after the match. Rounds 18 and 19 blew up. Only use them for woodchucks now.

I used 220 SMK for a year and went to the 210 matchkings this year. I have put a hundred or so through it and 35 rounds through it last Saturday, without cleaning, with the same charge and powder as my previous test. Performance similar to Berger. But no blowups.

I played alot with the 30-378 in factory mode. 200 gr Accubonds with 106gr of Retumbo was what it liked. I assumed they tolerated the jump better than others I tried.

Good luck,
Shummy
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  •   #23  
    Unread 05-22-2006, 12:00 PM
    bsb bsb is offline
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    Re: 210 bergers blowing up?? help 30-378 wby

    Wow hoyt! that just dont make no scense I bet that ticked you off big time! I think the 210S are out of the picture for us, The 168s seem ok so far.
    those jackets must be so sensitive, Too much, thanks for post
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      #24  
    Unread 05-22-2006, 12:36 PM
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    Re: 210 bergers blowing up?? help 30-378 wby

    Shummy, how would you compare the performance of the 210 Sierra to the 220 at 1000 so far? From its published BC, it looks somewhat disappointing. Are you finding it does better than the ballistic charts would predict?
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      #25  
    Unread 05-23-2006, 07:42 AM
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    Re: 210 bergers blowing up?? help 30-378 wby

    This may be off the wall, but with that much freebore are there powders that would have ignition problems due to too low of a pressure? If the bullet has to move as far as you seem to indicate it would seem that some powders, especially in very cold conditions, might not maintain enough pressure to burn.

    edge.

    ( sorry newby question)
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      #26  
    Unread 05-23-2006, 11:20 AM
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    Re: 210 bergers blowing up?? help 30-378 wby

    There is generally enough bullet weight and powder charge weight to promote adiquate ignition but you are correct in that velocity consistancy can increase.

    This is one of the main reasons you do not see rifles designed for extreme accuracy to have freebore.

    Most of these loads are also loaded up to pretty top end chamber pressures. As such the issue of hangfires is reduced but yes with lower end loads, this can be a real issue.

    Kirby Allen(50)
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      #27  
    Unread 05-23-2006, 08:37 PM
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    Re: 210 bergers blowing up?? help 30-378 wby

    JonA,
    Drops are nearly interchangeable in my application. "My" BC for 220SMK is .601 and 210SMK is .590. Looks like 210 gives up 60lb energy and an inch in a 10wind at the speeds I ended up with. They shoot slightly better in my rifle.
    For reference I figure a .551 for a 200gr Accubond. I can't relate this to any calculated BC, not changed based on speed but rather a single value that I use to shoot stuff from 100 to 1300 yards using a program that calculates very similar to Exbal.

    Cart-Bul-Speed-Wght-BC-Scope-Temp-Alt-MM-MOA-Engy-Spd-10Wind-Yards
    300wby-SMK-2940-210-0.59-2.05-55-1200-1.05-26.94-1086-1526-70-1022
    300wby-SMK-2915-220-0.601-2.05-55-1200-1.05-27.19-1144-1531-69-1022

    Hope it helps,
    Shummy
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      #28  
    Unread 05-23-2006, 11:09 PM
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    Re: 210 bergers blowing up?? help 30-378 wby

    [ QUOTE ]
    Hope it helps,
    Shummy

    [/ QUOTE ]
    Yes it does, thanks.
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