375 RUM 350gr. Bullets?

Discussion in '.375 & Up' started by JMJ888, Aug 20, 2019.

  1. bruce moulds

    bruce moulds AH Elite

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    toby 458,
    if that was one bullet you might wonder if it hit a stick or something, but 2 bullets is forming a pattern of behaviour.
    I do not blame you for your questions.
    I have reappraised my thinking on this subject after seeing the above.
    keep impact velocities down with those bullets.
    bruce.
     
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  2. Forrest Halley

    Forrest Halley AH Senior Member

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    Well I hope your theory testing goes well. If the RUM doesn't work out, you could always build your own .375 stopping rifle on a .505 Gibbs action and use the .375 Cheytac. I'm pretty sure you'd win any penetration contest at that point and you could tailor from 175-450 grains... I just wonder how much the Cheytac would recoil without a brake...
     

  3. TOBY458

    TOBY458 AH Elite

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    Does he have any recovered bullets for us to gander at?
     

  4. colorado

    colorado AH Fanatic

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    I would soooo stay away from that.
     
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  5. JMJ888

    JMJ888 AH Member

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    Going to stick with Barnes load data initially and get a good baseline over chrono with the 350TSX and H2O capacity with ADG brass. Testing AA2700, H4350, and IMR4350 from Barnes data.

    Once I can establish the H2O on fired case I will dial Quickload in a bit and move forward with the VV N560. RL26 actually shows to be at the top of powder query but given that it is about as rare as unicorn farts I am going to avoid it.

    Should be an interesting load development project.
     

  6. bruce moulds

    bruce moulds AH Elite

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    back to the op's question.
    my friend shot some std 375 Woodleigh 270 gn pp into dead camels.
    at close range, one stayed in the head when shot from behind.
    when I reported this here, ben kk mentioned that 300 gn woodleighs might have been a bit soft for water buffalo at close range.
    Woodleigh have a harder version for tougher conditions, which might well include the 375 rum.
    not sure it a 350 gn is available.
    if all else fails, bill hober recommends running his swift aframes as hard as you can and hitting bone where possible.
    bruce.
     

  7. Wyatt Smith

    Wyatt Smith AH Enthusiast

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    Woodleigh has a 350 heavy duty round nose as well as the standard soft nose and 350 protected point
     
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  8. IvW

    IvW AH Elite

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    What!!!

    You have no clue about hunting and STOPPING DG at close range with a 375 caliber rifle....

    A 340, 350 or 380 gr Rhino bullet will outperform any 235 gr TSX all day any day under the most dire situations on DG every time...and they will keep going in a straight line much better than any 235 grainer! SD and momentum is what is needed for DG not BC!!!

    You wanna shoot 235 gr or close to buy a 338....
     

  9. IvW

    IvW AH Elite

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    And so will a good premium 300 grainer...which should be the minimum weight for the old 375 H&H.
     
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  10. IdaRam

    IdaRam SILVER SUPPORTER AH Elite

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    :E Hmmm: Matt, are you referring strictly to the 350 gr TSX here? "a 350gr bullet will not perform as well as a 300gr bullet on game" seems like a pretty broad net to cast.
    Regardless, 235 gr TSX is no way, no how the best choice for DG. 275 gr CEB TSG Safari Raptor at 2600 fps, 300 gr A-Frame at 2400 fps, or 350 Rhino at 2250 fps win hands down every time in my opinion.
    Of course, I'm not that big a fan of the TSX anyway, so... :D
     
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  11. JMJ888

    JMJ888 AH Member

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    Finished up the first phase of load development with the 350gr. Barnes TSX and IMR 4350 powder in the Ultra Mag. Used new unfired ADG brass with charges of IMR 4350 from 80-85gr in 1/2 gr increments lit off with Federal 215 GM primers. Outside air temperature ranged from 98-101 degrees. All velocity was recorded with a LabRadar chrono...3 shot groups fired at 100 yds. OAL at 3.595” putting the TSX 0.030” off the rifling and functioning out of magazine.

    Velocity ranged from an average of 2425fps at 80.0g and peaked out at an average of 2586fps at 85.0g. I found a lower accuracy node at 80.5 and 81.0gr that were both sub 1”. The two that stood out were 83.5 and 84.0 loads by far.

    83.5g - 2529, 2529, 2529 - ES 0, SD 0, 0.540” group
    84.0g - 2557, 2541, 2559 - ES 18, SD 8, 0.760” group

    Was going to try a few other powders but don’t see much reason to at this point. 1/2” accuracy capable big bore with a ton of SD, trajectory matching the H&H/300gr combo, and the energy approaching or matching a 416 Rigby.

    Will load up some rounds to confirm loads and hunt a few pigs around here, and then likely try some wet newsprint penetration tests to see how the longer TSX performs.
     
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  12. CoElkHunter

    CoElkHunter AH Fanatic

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    Do all the RUMs have rebated rims? I know the .300 does. I’ve read where the rebated rims are not ideal for DG, but maybe it’s not a big deal? Thanks!
     

  13. JMJ888

    JMJ888 AH Member

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    Yes it’s rebated 0.016”. Less than half of the 0.039” rebate on the 500 Jeffery. No feeding or extraction issues on the rifle and would have zero issues taking it after DG
     
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  14. CoElkHunter

    CoElkHunter AH Fanatic

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    Thanks! So why design the rebated rim into the various cartridges in the first place? What’s the purpose? Thanks!
     

  15. bruce moulds

    bruce moulds AH Elite

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    to fit a std boltface?
    bruce.
     
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  16. Hoss Delgado

    Hoss Delgado AH Fanatic

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    I have been so content with 300 grain Cutting Edge Monolithic meplat brass Solids , than l never bothered to go to 350 grain... BUT
    Woodleigh does a 350 grain Soft nose and Full metal Jacket for the .375 bore :)
     

  17. CoElkHunter

    CoElkHunter AH Fanatic

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    Bruce,
    I don’t know for sure, but I would think a CRF rifle wouldn’t work with a rebated rimmed cartridge?
    CEH
     

  18. CoElkHunter

    CoElkHunter AH Fanatic

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    I’m assuming your .375 RUM with a rebated rim is still a CRF action after the conversion? I have been wondering if a CRF would work with a rebated rim cartridge? Thanks!
     

  19. Wyatt Smith

    Wyatt Smith AH Enthusiast

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    It should work fine as long the rim can slip under the extractor. Cz550 in 500 Jeff?
     
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  20. CoElkHunter

    CoElkHunter AH Fanatic

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    Thanks!
     

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