338 RUM question??

Discussion in 'Reloading' started by remingtonman_25_06, Feb 14, 2006.

  1. remingtonman_25_06

    remingtonman_25_06 Well-Known Member

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    I started plugging numbers once again for an LR elk/bear rifle. My initial plan was to just keep my 300 RUM, but go with a 28" or 30" barrel. I was also now thinking of the 338 RUM and shooting the 300g SMK. What could I expect for velocity wise with say a 28" or 30" barrel shooting the 300g SMK. The ballistics aren't bad even for say 2700fps, but I would really like to push it to 2800fps to really see any big advantage, then going over the 300 RUM and the 240g SMK at 3000.
     
  2. lerch

    lerch <strong>SPONSOR</strong>

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    Rem,

    Have you seen some of my old posts about the 338/300RUM, in a year or two I am planning on having Kirby build me this rifle throated to shoot the 300gr wildcats ULD RBBT with a 28" bbl.

    By necking up the 300 RUM case you get .010 longer body and match or exceed the capacity of the 338 Lapua.

    Should be hell on wheels for elk and bear.

    Good Luck
    steve
     

  3. remingtonman_25_06

    remingtonman_25_06 Well-Known Member

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    No, I have not seen any of the posts. Do you know what your expected velocity would be out of the 300/338 Ultra? I may just go that route. The 300 RUM case is a tad bit larger then the 338 I guess, is'nt it. I never really thought of doing that. If I could just get 2800 or even 2850 or 2900fps, I would definately go with the 338 and 300g bullets. If not, I'll probly settle with the 300 and the 225g uld or the 240g smk. I'll be making a lot more money when I get in the ARMY, so I'm really gonna be thinking of what rifle I want Kirby to build me. I'm just a numbers guy and always looking for something better, always plugging numbers.
     
  4. JD338

    JD338 Well-Known Member

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    remingtonman_25_06,

    I have a 338 RUM and love it. My longest shot was on an Elk at 350 yds w/ 210 gr PT. It was a bang flop kill. I can't speak to actual LRH but it is truely a hammer.
    The 338/300RUM is also known ase the 338 Edge. The case is .1" longer than the 338 RUM which will give you extra case capacity. The 338 RUM can push a 250 gr bullet close to 3000 fps and the 338 Edge is something like 3050 fps.
    Do a search on the 338 Edge and I know there is some good data available.
    Think of the cartridge case as an engine and "There is No Replacement for Displacement"! The .338 will hit a lot harder than the .308. Only downside is recoil but there are ways around it IF it bothers you.
    Hope this helps you out.

    Regards,

    JD338
     
  5. lerch

    lerch <strong>SPONSOR</strong>

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    I think it will either be the same or very similiar to the 338 EDGE. Looks like 3000fps is possible attainable with the 300gr SMK.

    Should pack a hell of a punch, excpecially with the 300gr ULD's.

    take it easy and have fun in the Army

    steve
     
  6. remingtonman_25_06

    remingtonman_25_06 Well-Known Member

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    OK. I'm familiar with the 338 EDGE. Just did not know the velocitys. If 3000 is achievable with the 300g, with a longer tube, I think I made up my mind!! 2900fps should be easily attainable then. That makes for a lot of POWER. Shawn Carlock seems to build quite a few of these. I might have to chat with him about it and get some numbers.
     
  7. lerch

    lerch <strong>SPONSOR</strong>

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    I am not sure what the diff between his 338 EDGE and the 338/300 RUM is, may not be anything. I dont know if you would be ahead to increase the shoulder angle or anything, should be a real power house.

    steve
     
  8. JD338

    JD338 Well-Known Member

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  9. uncleB

    uncleB Well-Known Member

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    [ QUOTE ]
    I think it will either be the same or very similiar to the 338 EDGE. Looks like 3000fps is possible attainable with the 300gr SMK.

    Should pack a hell of a punch, excpecially with the 300gr
    ULD's.

    take it easy and have fun in the Army

    steve

    [/ QUOTE ]Lerch,
    It is a powerhouse but 3000fps is probably not realistic with a 300grSMK unless you have a 40" tube.I have a 338 Lapua Imp with a 36" tube and 3050 is max.
    good luck UB
     
  10. remingtonman_25_06

    remingtonman_25_06 Well-Known Member

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    Uncle B

    Could you take an educated guess as to what you could expect with a 28" tube?? If I could split the difference and get 2850fps, it still packs a hell of a punch. I am kinda torn between that and the 300 RUM with a 28" and shooting the 240g SMK, or 225g ULD.
     
  11. Shawn Carlock

    Shawn Carlock Sponsor

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    The 338-300 Ultra is in fact a 338 EDGE I only named it that to avoid confusion about what you can chamber in it. It would be a real pisser for someone to chamber a 338 Ultra and touch it off with .100 excess headspace.
    With a 30" tube 300 grain bullets it will go 2900+, some powders, some barrels, some combos all with 30" tubes will go 3000+. All I have built with a 30" tube will go 2900+. I would not add extra inches to get over 3000 fps, it is in fact just a number boundry. In practical application the difference in performance between 2920 and 3001 is minimal, in the field you won't ever tell the difference, neither will the elk you just shot through. Hope this info helps.
     
  12. Ballistic64

    Ballistic64 Well-Known Member

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    One other factor with the 338 is that you may get a little better barrel life,not sure how much of a factor that would be.
     
  13. lerch

    lerch <strong>SPONSOR</strong>

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    Rem 25-06

    I think this combo would be a hell of a long range huntin rig. The more I think about it I wonder if you, and myself, wouldnt be ahead to go with a 338 lapua Imp so you could use that kick @$$ brass.

    I figure either of these calibers in a 27-28" pipe and get Richard Graves to make a ULD in around 285gr so you can get over the 3000fps, OH BABY!!!!

    Kinda makes ya fell sorry for whatever is on the impact end of the bullet

    take it easy
    steve
     
  14. remingtonman_25_06

    remingtonman_25_06 Well-Known Member

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    Shawn

    Thanks for chiming in. I was hoping you would see the post and give me some real numbers. That is indeed smoking velocity, and with that size bullet with the high BC makes for a very lethal weapon. I read the review on snipers paradise. Very nice. I would like to have my rifle built by October. My elk season is middle of November. I ran the numbers and they look something like this. The 240g SMK @3000fps will give you about 1750 lbs and still traveling a tad over 1800fps at 1000 yards. From a 200 zero it drops 225 and the drift in a 10mph wind is about 51 inches. Now the .338" 300g SMK starting at 2800fps, which is 200fps slower still has 2000ls of energy, and going about 1730fps. It drops 254 inches and will have 51 inches of wind drift. If you can get it going 2900fps, then it will have almost 2200lbs of energy, and going over 1800fps. Thats a lot of power at 1000 yards. I to would not want to be on the receiving end of that bullet. You are right about the elk not knowing the difference of 100fps either. Dont mater if hes getting hit with 2000lbs or 2200lbs, I think he'll still feel it either way. When I get my first couple checks from the army, I'm gonna send the money to my dad and have him send my rifle off to someone and I"ll either have the 300 RUM built or 338 EDGE built with a 28" and a brake. I think it will be an awesome LR elk/bear rifle out to 1200 yards or so, which is as far as I have a place to shoot right now to practice.