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  1. #11
    LRO Owner ~ Review Editor ~ Long Range Hunting Specialist Broz's Avatar
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    Remember though. The Saami 300 RUM chamber is a free bore chamber with a large jump. So just because you may not be able to mag feed a bullet touching the lands, doen not mean it will not shoot with some jump. The RUM family, like Weatherby was intended to be jumped.

    If you want the ELR 300 RUM go for it. Chances are you would be fine.

    Jeff

  2. #12
    Senior Member Chippewa's Avatar
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    You'll wana go with the biggest fastest once you start loading for your RUM.
    I went with the mag length, run-n-gun, idea when I got a Ridgeline RUM using the 212eldx. They shoot great an all an are more than deadly at 3050fps while jumping 0.136".
    After reading on LRO awhile it kinda seems silly to have a mag at all when you can single feed bigger, at same speeds, an not have recoil bangin up your nice reloads. Plus it would push us all to be striving for perfect, One shot One kills.

    CA carbon is tough to put down once you see it in person.

  3. #13
    Just bought the same gun Chippewa! Currently starting load development for the 212eldx. Would you mind sharing your load data
    Browning xbolt longrange 28 nosler
    180eldm @ 3150fps

    wby vanguard 6.5-300wby
    147eldm @ 3280

    New CA ridgeline 300rum
    212eldx under load developement!

  4. #14
    Senior Member Chippewa's Avatar
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    PhotoPictureResizer_190917_121328256_crop_3412x2982.jpg
    If you didn't upgrade to the side port brake yet you might want to. I followed Broz's advice from one of the threads an getting a good spiked bipod plus bag with its tuning ability really helps you find the loads true zero quicker. Plus do the barrel break in steps CA recommends. Also I overbedd with Devcon steel the full action area to 1/2" in front of lug. Clean n lube with good old Pennsylvania Boretech products after each trip tothe range.

    Norma brass (fire formed with 85g H1000) stainless tumbled.
    .002" shoulder bump back resizing,
    and annealed on 3rd reload with Templiaq.
    90g H1000 (3050fps at flatlander 300ft elevation here)

    Fed215M primers in just factory pockets.

    .003"ish neck tension on 212g bullets with rears lubed up with Hornady Unique paste.

    One thing to note is primers cratered every shot from my rifle even at starting load workups. Also I bought an early model NXS velocity with 1000y reticle. Which is most accurate for this load for where i'll be hunting. So if you want a little more speed just watch for pressure signs like dual ejector marks. I tried rl25 an got those a few times.

    Good luck an safe shootn! Do forget hearing pretection.

    Jeremy

  5. #15
    Your just loading at mag length? Im going to try retumbo as its just what I have for right now so I'm gonna give it a shot!
    Browning xbolt longrange 28 nosler
    180eldm @ 3150fps

    wby vanguard 6.5-300wby
    147eldm @ 3280

    New CA ridgeline 300rum
    212eldx under load developement!

  6. #16
    Senior Member Chippewa's Avatar
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    My Ridgeline magwell dim is 3.710". A cartridge length to tip at 3.69" then measured with Hornady OAL gauge at even 3.000" with the 212g eldx. So using the OAL gauge on the rifle gave a very consistant 3.136". Just for myself I then mesure that cartridge to tip an got 3.830". So .136" jump seems long but load seems to work.

  7. #17
    My Classic 338LM can run just under 4". I think 3.97" is the max. I currently run standard book-ish length.
    LT

    "The mountains were his masters. They rimmed in life. They were the cup of reality beyond growth, beyond struggle and death. They were his absolute unity in the midst of eternal change."

  8. #18
    That's what I've got mine seated to as well! Hopefully gonna try to shoot today if this rain stops. Have you done shooting with the 225eldms I bought some of them as well
    Browning xbolt longrange 28 nosler
    180eldm @ 3150fps

    wby vanguard 6.5-300wby
    147eldm @ 3280

    New CA ridgeline 300rum
    212eldx under load developement!

  9. #19
    Senior Member Chippewa's Avatar
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    Muncy Pennsylvania
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    No only 212g.


    And would love to get the MPR in 338LM.

  10. #20
    Senior Member Chippewa's Avatar
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    Also if you try the 225s id load em where ever the shoot best an the heck with mag well. Also if you can try that infamous N570 powder...

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