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7mm RUM or 338 Lapua Mag for Long Range Pdoggin

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  #1  
Unread 11-14-2008, 09:13 PM
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7mm RUM or 338 Lapua Mag for Long Range Pdoggin

Hey guys, I am getting ready to start collecting parts for a new long rang Pdog rifle. I will be building this rifle for shooting dogs out to 1500 to 1700 yards. What cartridge would you recommend. I like the 7RUM because it gives me many choices on excellent VLD type bullets from 162 A-Max to the 180grn Berger. The 7RUM can push the 180grn bullet with a BC of .684 out of a 30" tube at around 3350fps. How does that bullet and velocity compare to a the 338 Lapua Mag pushing the 300grn Matchking at around 2950fps. What do you guys think. I know the Lapua brass is better, but what cartridge and bullet combo will be more deadly out to 1500 yards. From what I can see, the 7RUM with the 180grn VLD at 3350fps has better ballistics than 338 LM with the 300grn MK out to 1500 yards, less drop and windage. Please, give me some info so I can make the correct choice.
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Last edited by TheReeper; 11-14-2008 at 09:31 PM.
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  •   #2  
    Unread 11-14-2008, 09:49 PM
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    Re: 7mm RUM or 338 Lapua Mag for Long Range Pdoggin

    Quote:
    Originally Posted by TheReeper View Post
    Hey guys, I am getting ready to start collecting parts for a new long rang Pdog rifle. I will be building this rifle for shooting dogs out to 1500 to 1700 yards. What cartridge would you recommend. I like the 7RUM because it gives me many choices on excellent VLD type bullets from 162 A-Max to the 180grn Berger. The 7RUM can push the 180grn bullet with a BC of .684 out of a 30" tube at around 3350fps. How does that bullet and velocity compare to a the 338 Lapua Mag pushing the 300grn Matchking at around 2950fps. What do you guys think. I know the Lapua brass is better, but what cartridge and bullet combo will be more deadly out to 1500 yards. From what I can see, the 7RUM with the 180grn VLD at 3350fps has better ballistics than 338 LM with the 300grn MK out to 1500 yards, less drop and windage. Please, give me some info so I can make the correct choice.
    Reeper,
    You have a good sense of humor, with that said put down the crack pipe for a few minutes.
    If you want a 1mile pdog gun you are much better off going with a 6mm or a 6.5mm.
    If you really think a 7RUM is better than a 338LM keep hitting your crack pipe and I will keep laughing.
    UB
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      #3  
    Unread 11-14-2008, 10:39 PM
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    Re: 7mm RUM or 338 Lapua Mag for Long Range Pdoggin

    UncleB, not smoking crack. I was just trying to get some opinions. I ran the Ballistic chart for 180grn VLD and the 300grn MK and this is what I got with a wind speed of 10mph. I used the Nightforce Ballistic program

    180grn VLD @ fired at 3350fps 0ut to 1500 yards-36.00 MOA for elevation and 7.50 MOA for windage.

    300grn MK fired at 2950fps out to 1500 yards-44.75 MOA for elevation and 7.75 MOA for windage.

    I am trying to learn and that's why I am trying to find out what cartridge would be better for this goal of shooting a small Pdog at these ranges. Your help and explination would be great. From what the NF program is telling me, the 7RUM load with a 180grn VLD will give me the best chance. If I am missing something, please let me know.
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      #4  
    Unread 11-15-2008, 07:06 PM
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    Re: 7mm RUM or 338 Lapua Mag for Long Range Pdoggin

    My 338 Edge works for woodchucks,300gr SMK's,no 1000yd shots yet,but i'm trying.
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      #5  
    Unread 11-16-2008, 12:30 PM
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    Re: 7mm RUM or 338 Lapua Mag for Long Range Pdoggin

    Definately a .338 -.338 ackley would be my choice.

    When berger and hornady come out w/ the big vld's and amax you'll have a great longrange set up.
    The 7rum will probably shoot out the barrels in 1,000 rounds or so -so si'd stick w/the bigger diameter barrel.
    Also i'd go w/ the longest barrel i could so you can rechamber and recrown it a time or two.
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      #6  
    Unread 11-16-2008, 04:38 PM
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    Re: 7mm RUM or 338 Lapua Mag for Long Range Pdoggin

    Thanks for the info guys. That's a good point about the new 338 Berger and Hornady bullets. I am going to go with a 338 Lapua Improved and go with a 30" barrel. Should be able to push the 300grn bullets at 3000fps. Once again thanks for the info.
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      #7  
    Unread 09-01-2009, 11:06 PM
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    Re: 7mm RUM or 338 Lapua Mag for Long Range Pdoggin

    Hello I'm new to this site I'll try and help you with your 7mm rum and 338 lapua prob. I think you should do the 7mm rum myself. For even if just because of the higher bc. I don't care if a bullet is more heavy. It doesn't mean they all ways hit harder. A 30 call hits harder than a 7mm out to about 350yrds. But past that the7mm blows the 30 call away. The 7mm also has less recoil witch means better accuracy, and that's what really counts on a long range varment rifle. Heck for any rifle at that. There is not a 30 call rifle out there that hits harder than a 7mm rum. Period. Well there is John lazzeroni arms. But hell I don't make that kinda money. If you think the 7mm rum is fast you should really check lazzeroni arms. You can add another 200 to 250 fps. I hope this helps you. Oh and check out armlites ar30. To bad it's not a 7mm.
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