Goto powder for 7mm weatherby??

Discussion in 'Reloading' started by fisherman983, Aug 28, 2018.

  1. fisherman983

    fisherman983 Well-Known Member

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    Trying to load fir a buddy's 7mm weatherby in a weatherby rifle. Having some serious trouble getting it to shoot.

    Using the 150 eld-x and retumbo on a suggestion and only got 2640 fps.. thats way way too slow.
    Bergers wouldn't shoot and I wanna stick with 150 eld-x.

    Thinking of trying R22 or imr 7828.
    What do u guys think I should try?
     
  2. Rhett Crider

    Rhett Crider Well-Known Member

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    I would look at RL 26 or 23. RL 23 is more temp stable and should get you to 3000fps w/ 24" barrel. RL 26 even more. I use it in my 7RM w/ good results.
     
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  3. Axl

    Axl Well-Known Member

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    I have a buddy with the same gun H4831sc gets 3080fps w/150's
     
  4. MudRunner2005

    MudRunner2005 Well-Known Member

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    Not really a surprise there... Weatherby cartridges are still using the same outdated horrible design with tons of freebore in it. Back in the 1940's (when they were designed) Roy added in WAY too much freebore to keep chamber pressures down. The reason is, because back then, the only way to get more velocity was to stuff more powder behind a bullet. Now days, thanks to technology, we have different and better powder options that can do the same, without the need for freebore, or stuffing crap-loads of powder behind a bullet to achieve the same results.

    Your best bet would be to neck-size his brass (once it's been fired), then seat the bullets to somewhere between factory depth, and then work up a load using either IMR 7828 or Norma MRP.

    MRP is what Norma uses to load for factory Weatherby ammo from .257 Wby up to .300 Wby.
     
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  5. cape cove

    cape cove Well-Known Member

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    As I stated on another thread, Norma MRP works great in mine. I use the 145 Barnes LRX and with a max load I get 3327 ft/sec and good accuracy. I began at max magazine OAL and reduced from there till I got the accuracy I was after. I tried RL-26, Retumbo, IMR 7828, and other slow burners and while they were good none done what MRP could do in mine.
    As far as bullets go don't get stuck on one bullet. Regardless what you may do some rifles just don't shoot certain bullets.
     
  6. pwohlwend

    pwohlwend Member

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    I use 50 gr of IMR4350 for my weatherby 7mm rem mag when pushing a 150 gr Hornady FMJBT. Very consistent groups out to 600 yards.
     
  7. Hatrick

    Hatrick Well-Known Member

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    What kind of velocity do you get? I load 60grs of that in my 7mm Rem with a 160gr Combined Tech Partition for 2850.