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Which 338 to build, RUM, Norma or Lapua

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  #8  
Unread 05-25-2011, 11:24 PM
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Re: Which 338 to build, RUM, Norma or Lapua

The 338 RUM is just as capable as the Norma and Lapua and a lot easier to find factory ammo
at a reasonable price.

If anything, the rum is a little faster than the Norma and the Lapua because of case capacity.

If I were going to build an all out custom, With no concerns about cost and reloading It would probably be a 338 Lapua 37.5 shoulder improved . This would give about the same case capacity
as the RUM but with wonderful brass.

The next step up is the 338/378 and about the most powerful factory cartridge in 338 (They are
expensive compared to the RUM).

Then comes the excalibur . This is a powerhouse with 130 to 145 grains of case capacity depending
on the powder used.

Depending on the distance you want to shoot/hunt the old 338 Winchester is a fine cartridge and
ammo is the easest and cheapest to find.

J E CUSTOM
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  •   #9  
    Unread 05-26-2011, 07:50 AM
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    Re: Which 338 to build, RUM, Norma or Lapua

    Quote:
    Originally Posted by J E Custom View Post
    If anything, the rum is a little faster than the Norma and the Lapua because of case capacity.

    J E CUSTOM
    Jerry, I am surprised to hear this. In my experiences the with some custom RUM's they were slower than the Lapua and if you loaded them to the same charge as a Lapua the Rem cases were done in only a few firings.

    All my experience is with 300 gr bullets.

    I can't speak for the .338 Norma as I have never owned one.

    Jeff
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      #10  
    Unread 05-26-2011, 08:45 AM
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    Re: Which 338 to build, RUM, Norma or Lapua

    Quote:
    Originally Posted by Broz View Post
    Jerry, I am surprised to hear this. In my experiences the with some custom RUM's they were slower than the Lapua and if you loaded them to the same charge as a Lapua the Rem cases were done in only a few firings.

    All my experience is with 300 gr bullets.

    I can't speak for the .338 Norma as I have never owned one.

    Jeff
    Yes you are right if you load both cases to "There max" the Lapua will take more pressure and
    therefore be as fast or faster.

    The Lapua case has less case capacity than the RUM and with the loads at 100% case density
    You have to use faster powder to achieve the same velocity with the same approximate
    pressure.

    I know longer load "Maximum" loads to get velocity, I just go to a larger case. This keeps things
    simple and trouble free.

    With the Improved Lapua, case capacity is almost identical to the RUM an last much longer
    if loaded the same way as the RUM.(But with the Lapua brass loads can be hotter and still
    last longer if a person wants to).

    I try never to recommend hot loads to anyone I personally don't know because instead of them
    starting lower they allways start where I worked up to. (I have a load for a 30/378 that uses
    a 200 gr bullet with 126 grains of powder) and it is not maxed out in my rifle because I have
    done some things that allow me to reach velocities that are unheard of.

    Also I like the 225 and 250gr bullets for hunting and have a different outcome than you will
    with the 300 grain bullets In the RUM.

    My Ratings are based on Factory ammo only and listed max loads in most reloading books.

    I am not always good at explaining things so I felt like you were due an explanation of how
    My results differed from yours. So I guess we are both right .

    As I said I no longer load to the max(Like I did when I was younger and would load to one
    firing of the brass and tossing it). now I just go to a bigger case if I want more velocity Like
    the 338/378 or even the excalibur.

    I hunt with the 338 RUM and It will do everything that I want and is easy to load, and factory
    ammo is available.

    I would like to build myself a 338 lapua improved but so far the RUM has performed flawlessly
    and it's hard to justify if you know what I meen.

    Sorry for the long winded post but I respect your opinion and experance.

    J E CUSTOM
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    Last edited by J E Custom; 05-26-2011 at 08:50 AM.
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      #11  
    Unread 05-26-2011, 09:12 AM
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    Re: Which 338 to build, RUM, Norma or Lapua

    Thanks for the explanation. These days I tend to think of everything with the larger bullets. I load up the ladder until I see pressure or find the accuracy node. I just have not been able to get the .338 Rum up to the velocity of my Lapua. But you are correct. The RUM will do everything needed in this velocity group caliber. If someone would make some RUM "Lapua quality" brass things would be different. The .338 / 300 Rums I have experience with were just a tad faster than my Lapua. Like 30 ~40 FPS. But again brass life was not even close to the Lapua. This was all with Rem Brass and again if there was a tougher option for brass I suspect things to be diferent. Or like you said smaller bullets and different powders. I have had such great luck with H-1000 in .338's I always go to it first.

    Thanks!

    Jeff
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      #12  
    Unread 05-26-2011, 10:05 AM
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    Re: Which 338 to build, RUM, Norma or Lapua

    Quote:
    Originally Posted by Broz View Post
    Jerry, I am surprised to hear this. In my experiences the with some custom RUM's they were slower than the Lapua and if you loaded them to the same charge as a Lapua the Rem cases were done in only a few firings.

    All my experience is with 300 gr bullets.

    I can't speak for the .338 Norma as I have never owned one.

    Jeff
    Consider the >usable< case capacity lilmited by practical seatiing depths and magazine lengths. The 338 Norma Mag has the same length case as a 338 Win Mag. Loaded with the same bullets to the same seating depth the 338 RUM gives more muzzle energy. Loaded to the same COAL the 338 Norma gives more. I shoot both and also a 338-378 Wby. With short light huning bullets the 338 Norma gives the least range and energy,, but with 300 grain VLD bullets and a 3.6" magazine limiation I consider the 338 Norma the best of the three.

    I chose the 338 Norma Mag over the 338 Lapua as it too suffers if restricted to a 3.6" magazine, though not as much as the 338 RUM or 338-378Wby.
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      #13  
    Unread 05-26-2011, 06:43 PM
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    Re: Which 338 to build, RUM, Norma or Lapua

    If you are doing a remington action do the 338 RUM. It is the best fit on your action. I didn't see where you were converting a remington.

    Broz, I spent quite a lot of time with the RUM and Lapua case back in the 90's and shot numerous ones head to head. I have never seen a 338-300 RUM that would outshoot a 338 Lapua if they are both loaded hot. Loaded to same pressures they are the same rifle along with the 338 RUM. All those three are identical. But the Lapua brass can be loaded hotter therefore getting higher velocity. With all the tests I did the 338 Lapua on average will shoot 75 fps faster than the 338-300 RUM when both are loaded hot. That is why in 2001 when the 338 RUM came out I dropped the 338-300 RUM I had been doing since 1998 and went with the 338 RUM and 338 Lapua. There was just no sense in wildcatting the 338-300 RUM any more.
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