300 Ultra Twist / Bullet Weight?

Discussion in 'Long Range Hunting & Shooting' started by shooters, Jul 10, 2018.

  1. shooters

    shooters Well-Known Member

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    I have a new Christensen 300 RUM. Has the normal 1:10 twist. All the RUM’s I’ve ever owned have had the 1:10. I’ve always shot the 200g Accubond and ELDX without issue and been happy with results. I’m sure the only real way of knowing will be to shoot them, but would the ELDX 212’s be too heavy out of the 1:10 Ultra? I’m just trying to save a few $$ if those that are out there have any experience. I used Bergers calculator but not sure of the accuracy. Also wondering if the bullets are just too long for that rifle.
     
  2. sable tireur

    sable tireur Well-Known Member

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    Accuracy is rifle (equipment) and shooter dependent. Excellent shooters with excellent equipment often can shoot a wider variety of components with satisfactory accuracy. Top accuracy begs the best of the best.

    We can't assure you of the accuracy of these bullet except in the most generic of circumstance. Yes, they are a good bullet but equipment variables can have an impact on the accuracy you're looking for. I've shot them in one of my .300 RUM rifles with decent accuracy out to 300 yards but I didn't have access to a longer range at the time.

    The 212 will be stable at the top end of the velocity range which is also at the top end of the pressure range. Why not consider shooting the 200 ELD-X instead? Twelve grains of bullet weight won't be that significant in term of harvesting animals.
     
  3. Bigdad

    Bigdad Member

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    According to the JBM Stability Calculator the 212 ELDX is stable in a 10" twist barrel. If you use the calculator the bullet length is 1.60". I input .15" in the plastic tip field.

    I shoot the 212 ELDX in my 1:10" 300 Win Mag and it is very accurate and have not had any stability issues.

    http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi
     
  4. lancetkenyon

    lancetkenyon Well-Known Member

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    I shoot the 215 Berger Hybrid and the 230 Berger Hybrid out of my 1:10" twist .300RUM with excellent results.

    However, I never could get the 212 ELD-X to shoot well. But then again, out of 10-11 rifles in all different calibers and bullet weights, only 3 shot an ELD-X really well. One 7RM and two 6.5CMs.
     
  5. RockyMtnMT

    RockyMtnMT Official LRH Sponsor

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    What range do you realistically hunt to? Are you saying that you don't want to spend the money to try the 212g if others can say that it doesn't work well in the 10" twist or doesn't fit the mag? I don't see that Hornady lists the length of the bullet.

    Steve
     
  6. RockyMtnMT

    RockyMtnMT Official LRH Sponsor

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    At 1.6" in the 10" twist the 212g is marginal at sea level for stability. Elevation will add exterior ballistic stability and should aid in ability to shoot them well. When it comes to terminal performance I would recommend staying with the bullets you are currently using as the higher stability that they have will aid in on game performance. I don't see any real gain in going up the 12g.

    Steve
     
  7. shooters

    shooters Well-Known Member

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    Thanks. A lot of this is fairly new to me so trying to pick up what I can here and there. As far as asking if the 212 will work. I don’t know if they will fit in the Christensen magazine at a decent length using the 212 and or if that barrel will stabilize that heavy of a bullet. A lot of this had me doing some thinking when I typed in the 180 Hammer bullet. It was the heaviest bullet weight I could shoot according to the Berger program. But it seemed all other heavier bullets over 200g would shoot just fine. So I started wondering if I would be wasting my time and money even trying the 212 ELDX. As far as realistic shots, hopefully under 600 yards. I would normally stick with the 200g but in September I’ll be back up in Alaska Moose hunting and just want to make sure I have as much HP as possible on a big bull. I’ve also heard from reputable/ knowledgeable members that if your shooting a 300 RUM, your not taking advantage of the caliber until you start shooting those heavier 210 and up bullets.
     
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  8. Bigdad

    Bigdad Member

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    I see no reason the 212 gr will not stabilize just fine. The Berger calculator does not take into consideration the plastic tip like the JBM calculator does thus giving a lower stabilization value. I know several folks shooting the 212 in their 300 WMs with good success. My Savage 111 LRH mag length will allow me to load to 3.50" OAL about .040" off the lands but it likes more jump and my accuracy load OAL is 3.450".

    I'm not sure bout your Christensen but most rifle mags will accept 3.5" OAL.
     
    Last edited: Jul 11, 2018
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  9. Beardeddeer91

    Beardeddeer91 Well-Known Member

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    I shoot the 212 ELD-X out of my 300 WM in a 1-10 and have had zero issues with it. I’m pushing it around 2900 fps and have shot it out to 1000. Your Rum should have no issues as others have already stated.
     
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  10. RockyMtnMT

    RockyMtnMT Official LRH Sponsor

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    "Taking advantage of the 300 rum" is a statement that is very dependent on what your goals are. This blanket idea that everyone that isn't shooting the heaviest possible bullet in any given cartridge is wasting the potential of the cartridge is very sorry sighted. This is a long range forum so yes the heaviest highest bc bullet will eventually be able to reach the farthest. Often not until well beyond the usable hunting range of the season system or the ability of the hunter. Frankly the 300 rum running 181g Hammer Hunter at 3450fps beats most every rifle bullet combo out there in every way out to 1000y. Out to your distance of 600y bc almost doesn't matter in the rum. With the loads that you are looking at the 200g ab is going to be best. Out to 600y whatever bullet You choose you will be better off with 180g to 200g bullets. Unless you use highly frangible bullets. Then you need to slow them down so that they don't blow up on a shot under 200y. May as well use a 30-06 if you want to keep your vel down at 2700fps.

    Yes the lead core bullets can shoot heavier for twist than the pure copper bullets. Lead is more dense and be heavier for length making them require less twist to stabilize. Just physics.

    Many here will differ with me. You have a rocket sled out to the ranges you intend to hunt. Don't limit it by slowing it down and getting rid of the advantage it gives over almost every other cartridge out there.

    Steve
     
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  11. HARPERC

    HARPERC Well-Known Member

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    The Hammer site indicates the 199 Sledge Hammer indicates a 1-10.5" twist.

    I don't know how that meshes with your intended use parameters.
     
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