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Who's stretching it out with a 270 WSM?

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  #50  
Unread 04-25-2012, 11:56 PM
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Re: Who's stretching it out with a 270 WSM?

Anyone care to comment on the temp stability of '22 vs. Magpro? Trying to decide which route to go...
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  •   #51  
    Unread 04-26-2012, 03:25 AM
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    Re: Who's stretching it out with a 270 WSM?

    Couldn't really say. I do my load work in the Spring/Summer and shoot all year long. Haven't really noticed too much difference with RL22 or Magpro, in my case. I do notice that RL22 will climb in speed if shot quickly, due to chamber temps, but if allowed to cool, RL22 has been excellent as has Magpro.
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      #52  
    Unread 04-26-2012, 05:56 AM
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    Re: Who's stretching it out with a 270 WSM?

    Same here RE 22 and 150 bullets excellent velocity and accuracy and Reumbo for the 165 gr bullets
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      #53  
    Unread 04-26-2012, 09:51 AM
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    Re: Who's stretching it out with a 270 WSM?

    Quote:
    Originally Posted by Truc View Post
    Same here RE 22 and 150 bullets excellent velocity and accuracy and Reumbo for the 165 gr bullets
    I have heard great things about Retumbo/RL25 and the 140 AB's as well. Just haven't messed with it as RL22 works pretty well for me.
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      #54  
    Unread 05-06-2012, 06:46 AM
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    Re: Who's stretching it out with a 270 WSM?

    Can anybody tell me how fast I would have to get the .277 170 grain Bergers to stabilize in a 1 in 10 barrel? I am currently getting 3,420 fps with 140 grain Accubonds out of my 270 Dakota with 27 1/2 inch 1 in 10 barrel, so I could probably push the 170s at about 3,100. Also, I am thinking of a very heavy 28 inch barrel with 1 in 10 twist on a 270 WSM built on a long action or single shot bolt action to seat the projectiles way out, for varminting past 500 yards. I am aware that 1 in 10 twist is a bit slow.
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      #55  
    Unread 05-06-2012, 10:56 AM
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    Re: Who's stretching it out with a 270 WSM?

    First we need to know the length of the Berger 170 gr bullets to use a formula to figure out the stability of the bullet. The Greenhill formula is the best known but RSI says they have a nore accurate one.

    Second, what kind of powder are you using and what charge. It sounds like you have a real impressive load. Remember that 140 Accubonds have a higher BC than the Bergers.

    For 170gr bullets I would expect that VV N-570 would be your highest velocity powder.
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      #56  
    Unread 05-06-2012, 07:24 PM
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    Re: Who's stretching it out with a 270 WSM?

    Quote:
    Originally Posted by longarm View Post
    Can anybody tell me how fast I would have to get the .277 170 grain Bergers to stabilize in a 1 in 10 barrel? I am currently getting 3,420 fps with 140 grain Accubonds out of my 270 Dakota with 27 1/2 inch 1 in 10 barrel, so I could probably push the 170s at about 3,100. Also, I am thinking of a very heavy 28 inch barrel with 1 in 10 twist on a 270 WSM built on a long action or single shot bolt action to seat the projectiles way out, for varminting past 500 yards. I am aware that 1 in 10 twist is a bit slow.
    Punch your numbers into JBM stability calculator. JBM - Calculations - Stability

    Your going to need to be 6000ft plus, I'm going to give them a try out of my WSM since the Matrix stabilize fine for me but bullet design makes a difference as well.
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