6.5 PRC vs 257 WBY Mag

Discussion in '6mm, 6.5mm, and .25 Cal (Not 6BR)' started by Ironworker, Sep 1, 2019.

  1. Ironworker

    Ironworker Silver $$ Contributor

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    I was thinking of getting a 6.5 PRC ,but even though the .264 bullet has a superior B.C over the .257 The velocity of the .257 Hornady 110 ELDx at 3600 trumps the 6.5 PRC even with 150gr Sierra at .713 BC .... But my 6mm Creedmoor with its fast twist Bartlien bbl will shoot circles around my Bartlien bbl 257 WBY . Is that because the 6mm CM simply isn't a fire breathing dragon like the 257 is ?
     
  2. wboggs

    wboggs Gold $$ Contributor

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    I suspect the .257 Wby has a very short barrel life when loaded like that. I used to have a .257 with a krieger target barrel and could never get good groups. But, they are plenty good enough for hunting and will.never be used for matches. Half your barrel life will be gone developing loads and fast long strings will finish it off quickly.
     
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  3. Ironworker

    Ironworker Silver $$ Contributor

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    I'm careful about how many and how often I shoot it. Great hunting accuracy ,but definitely not a target rifle.
     
  4. Beruisis

    Beruisis

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    when I reloaded for the 257 Roy, I couldn't develop anything more accurate than their factory ammo.
     
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  5. Ironworker

    Ironworker Silver $$ Contributor

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    I'm getting 3 shot 3/4-1 MOA at 100yds then let the bbl cool down for a week.With my 6mm Creed I can get 1/4 MOA all day long.
     
  6. Beruisis

    Beruisis

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    Best I could reload was 1.25" groups in the Roy but 25 Crd gives me 3/8" everytime.
    Yeah I only shot 3x & gave it a rest too. That Roy was a slow twist Kleingunther & I sold it back to the original owner. Thinking about getting another but 10T.
    Would you go with the Remington or Mark V? I lean towards the V.
     
    Last edited: Sep 1, 2019
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  7. AckleymanII

    AckleymanII Silver $$ Contributor

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    The Roy with a zero to .030 freebore chamber shoots tiny groups. All that freebore does nothing for bullet alignment.

    My load was 71.5g of R#22
    Fed 215
    100g Nosler ballistic tip, touching the lands
    3850 fps out of a 26" Pac Nor three groove barrel, 10T
    Bug holes were normal, on the sendero weight fluted barrel.

    Today, I would go 9T, throat for a 115g for 3600 fps
     
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  8. Ironworker

    Ironworker Silver $$ Contributor

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    Mark V and mine has a 10"twist .
     
  9. AckleymanII

    AckleymanII Silver $$ Contributor

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    Buddy of mine killed 6 nice bull elk with his Mark 5 shooting factory ammo. Then a guide told him it was not an elk rifle.
     
  10. Beeman

    Beeman

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    To make a more fair comparison, run the numbers on a 131 Blackjack out of the 257WBY. You may be surprised.
     
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  11. wboggs

    wboggs Gold $$ Contributor

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    Many gunsmiths will not use this throat due to liability concerns. Who knows what the.pressure of factory ammo would be
     
  12. Ironworker

    Ironworker Silver $$ Contributor

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    Clocked my loads today 69grs of IMR 7828 SSC pushed a Hornady 110 ELDx 3520 . 69grs of Re#19 pushed a 90gr Sierra green tip 3505 ? I was expecting faster .
     
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  13. Nomosendero

    Nomosendero

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    Which barrel length? I would work up slow of course with the 110 ELDX, I have a Lipsey Number 1 with a 28" tube, that should be a screamer.
    Have you shot any game with that 110 as yet?
     
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  14. AckleymanII

    AckleymanII Silver $$ Contributor

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    No worries, factory ammo will not chamber, bullet is seated deep in the case.
     
  15. Ironworker

    Ironworker Silver $$ Contributor

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    26"bbl Haven't been able to draw a tag. But I'll take it out for coyotes .
     
  16. wboggs

    wboggs Gold $$ Contributor

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    Good point. The gunsmiths I have talked with must be ultra sensitive to any problem using non factory specs.
     
  17. AckleymanII

    AckleymanII Silver $$ Contributor

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    After seeing how accurate and fast the Roy was with zero freebore, I had a reamer ground. A gunsmith out of San Diego gave the info that the Winchester brand of 264 Winchester could be necked down in one swipe with a 257 Weatherby full length sizer. Sure enough, the double radius is formed perfectly. The neck is a tad shorter which fixes any mix up in any factory ammo ever being able to be used in the chamber.

    Winchester 264 brass is tough, they key is to neck down three rounds and send to Reamer maker with bullet seated the length you want.
     
  18. 86alaskan

    86alaskan Silver $$ Contributor

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    If you're going to rebarrel, go ahead with the 257WBY and get a good 8 twist to let it shine with the 131's. I've yet to meet anyone shooting them that can't get great performance. The 257 out a a 26-28" barrel should be able to chuck those bullets out at least 3400fps, and no 6.5 is gonna keep up with that. I run those bullets around 3200 from my 25-06 and 7.5 twist barrel and it shoots flat and straight out to 3/4 mile all day.
     

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