Wanting .458 win mag chronograph results of factory

Discussion in '.375 & Up' started by Nhoro, Apr 7, 2018.

  1. PeteG

    PeteG AH Elite

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    We got 2,150 with peregrine 480’s quite easily. Also somchem.
    Good up hear others are using similar successfully.
     
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  2. Nhoro

    Nhoro AH Senior Member

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    What powder and number of grains did you use ? The 450 gr bullets have impressed me, I dug them out out of the gravel/ shale behind a target and they had little deformation and were still straight.
     

  3. PeteG

    PeteG AH Elite

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    S321 peregrine copper solid 480gr
    73gr +-2,100fps
    74gr +-2,120fps
    75gr +-2,150fps.
    Pulled the solid out after shooting through a bag of laterite and a conveyor belt backstop. A little deformation and showed an increased frontal area. AD980D45-B677-4615-B2A4-A79524CF4F12.jpeg
     
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  4. Nhoro

    Nhoro AH Senior Member

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    I assume that you seated the bullet out of the case somewhat-How many grooves out the case ? Attached is a pic of 3 bullets dug out of a shale/gravel bank. Approx 12-14 inches into the bank.
     

  5. PeteG

    PeteG AH Elite

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    We tried to seat them out further but the magazine well wasn't co-operating with us, we ended up using the COAL as recommended i believe, perhaps 1mm further out but i would need to check the notebook.
    i can check over the weekend for full details and get a pic of the loaded rounds.
     
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  6. Daga Boy

    Daga Boy AH Veteran

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    Have done a little experimenting with the 458 since I last posted .
    Using S321 and CCI250 Primers and loading about 1mm longer than standard my loads varied between 2120 and 2150 using hornady 500grn FMjs and interlocks. ( so 2135 average). No powder compression and no signs of excessive pressure
    In my CZ these loads are a long way short of max col and probably achievable in any standard length action
    Note though that fast burning propellants are very sensitive to adjustments in col , so a load which is 100% fine at a given col may result in excessive pressures if the col is shortened by even a mm/ few thou .
    BTW, These results also suggest that hornady's published velocities are correct in rifles of average tolerances and barrels of around 24" as the propellant they use yields higher velocities without increasing pressure
     
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  7. Nhoro

    Nhoro AH Senior Member

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    T
    Thanks for the he feedback. I have independently found confirmation of Hornady velocity and this is now handloads making the advertised specs today. What Happened at Winchester in the 60’s should stay in the 60’s !
     

  8. Ridge Runner

    Ridge Runner AH Veteran

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    Chronographed .458 Win Mag on Saturday, 06 July 2019 as follows:

    Temp: 86-90 degrees F
    Humidity: 70%-80%
    Wind: Not Applicably

    Firearm used:

    Interarms Whitworth Mark X
    Barrel length: 24 inches
    Sights: iron

    Ammunition used:

    Hornady Factory loads, 500 grain DGS, Superformance
    Number of rounds fired: 6

    Shot. Muzzle Velocity
    1. 2189
    2 . 2177
    3 . 2190
    4. 2089
    5. 2077
    6. 2121

    By reloading I should gain a more consistancy in more uniformity of muzzle velocities of 2100+ fps over any factory loads.

    I will update this post as soon as I receive my reloading accessories and reload some ammo go test.

    Hope this helps.
     
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  9. Nhoro

    Nhoro AH Senior Member

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    Thank you. That is helpful. The spread is more than I would expect at 112 FPS. Also interesting that the velocity seems to taper off on the last shots. Do you reckon the barrel warmed up and expanded a little ? Anyway seem Hornady 458 Ammo does what it says on the box- disproving the general thoughts in this thread. Ain’t nothin like cold hard facts !
     

  10. Ridge Runner

    Ridge Runner AH Veteran

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    2-3 shot groups about 5 minutes between each shot about 20 minutes between each shot shot group.
     

  11. IvW

    IvW AH Elite

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    Just shows the lack of quality and what ammo not to use especially for DG..

    The 458 WM is still marginal for use on DG in Africa, especially considering that there are so many more better performing cartridges in this caliber group.

    Personally I would not bother with one.

    In the African DG, game(unless it is all you can get your hands on) my or anybody else's life in the party is just not worth it...

    Use a different 458 caliber @ 2300-2400 or even better a .500 at the same velocity enough times and you will see there is a huge difference in the ability to sort out issues with DG at close distance.

    If recoil at that velocity is a issue with a 458 get a .400 caliber...a 458 bullet @ just over 2000 fps is gonna bite you somewhere along the line when dealing with DG. Same goes for Hornady Ammo and DG...I would never use ammo with more than a 100fps spread over six shots...I would not recommend that crap for PG never mind DG.

    One time hunter one buffalo, maybe you will be ok, maybe...working DG rifle no way...

    My opinion anyway, if the 458Wm rocks anybody's boat as a DG rifle, go for it, the PH is bound to get some more back up experience..
     

  12. IvW

    IvW AH Elite

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    For sure...

    Do not use this ammo on DG....Bad loading quality and shite bullets for DG...
     

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