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7mm RUM velocity with 180's

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  #1  
Unread 05-01-2008, 08:55 AM
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7mm RUM velocity with 180's

I'm thinking about getting away from the 338 and building a 7RUM for my new long range thumper. I have a Brand new savage action that failed to sell in the classifieds, so I'm forced to order a new barrel....how terrible.... I've been running the ballistics on both the 180 bergers (BC of .684), and the JLK 180's (BC of .735). My questions are what type of velocity is obtainable out of a 30-31" barrel with these bullets. I'm hoping 3300fps is a possible velocity. I know that my barrel will be toast after about 800-1000 rds. But with the bullets available I think it would be an awesome LR rifle. The JLK's @ 3300 are only dropping 18.1 MOA @1000 with a 100 yd zero with 4.0 minutes of windage with a 10mph crosswind. That's amazing!!...Thanks
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  •   #2  
    Unread 05-01-2008, 04:33 PM
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    I believe that you can run arounds 3000 FPS or a bit over with the 180s. Give them a try and let us know..

    What is your barrel lenght, I based my answer on a 26" barrel
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      #3  
    Unread 05-01-2008, 04:53 PM
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    JLK's?

    Im looking for bullets to try, to run through my 7mm RUM when i get it. what are JLK's
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      #4  
    Unread 05-01-2008, 05:11 PM
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    The JLK's are a custom made VLD bullet. I think the company is also called swampworks. You can google it and go to their website. I have heard alot of good things about their bullets on 6br.com. Used alot in 1000yd comp. I went ahead and ordered me a 30", #7, 9twist, 3 groove pac-nor today. Should be here in about 8 weeks and then I'll let you know what it will do. The nosler manual shows an STW @ 3047 fps with a 175 out of a 26" barrel. I think with the extra barrel length and the extra powder capacity, 3300 will be obtainable....hopefully.
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      #5  
    Unread 05-01-2008, 08:30 PM
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    Im building a 7rum too! Schnieder m40, contour 1/8 twist, 5r, 28". I was hoping to get at least 3200fps. I think it'll be a blast. Moly 180's. Good luck with your build!
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      #6  
    Unread 05-01-2008, 08:43 PM
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    Somebody should start a 7RUM build thread. I'm building two at the moment. Both using Rem 700 actions and Rock 30" 5r 9-twist AMU contour barrels. On the fence as to whether or not to AI them both or just one to compare.

    I'm hoping for around 3200fps with the 180's. Anything above that will be gravy if ES is low and groups are tight.
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      #7  
    Unread 05-01-2008, 08:55 PM
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    These numbers came out of my log book. All for the 180 Bergers. With a Mike Rock 8.7 5R in 7mm RUM.

    US 869
    99.1=3345
    100.=3367

    Retumbo
    88=3292

    H870
    92=3250

    These are just loads I was using. Not starting loads and not max loads.
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