500 Jeffery VS 505 Gibbs

Discussion in '.375 & Up' started by matt85, Aug 16, 2014.

  1. matt85

    matt85 BRONZE SUPPORTER AH Fanatic

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    ive been looking into to both these cartridges and for the most part they seem pretty similar. both are able to push 525gr/535gr bullets at 2300+ and both will push a 600gr bullet at 2100+ which means both fill my desires. the 500 Jeffery uses a more common bullet size but the 505 Gibbs case seems a little better built (in my OP). for what ever reason it seems the 600gr bullet for the 500 jeffery is a little harder to find since its typically loaded with a 570gr bullet (i prefer the 600gr for better SD).

    which do you like better and why?

    thanks
    -matt
     
  2. spike.t

    spike.t GOLD SUPPORTER AH Legend

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    matt i wouldnt have thought there are that many people out there that have much if any experience with both the .505 gibbs and .500 jeff :unsure:
     
  3. flatwater bill

    flatwater bill AH Senior Member

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    Matt.............I have never even shot either of these cartridges, but I want to buy a bolt gun to handle one, just the same. I asked your question to a man at SCI in 2011, who had both for sale. These were barreled actions still in the white. He claimed to have worked for Ferlach for many years, and I doubt there is a much better bolt than the ones they make. He said it was a no brainer....the Gibbs was better...................a longer neck for reloading, and no rebated case head, to be missed by the bolt when that rapid second shot is needed, but the magazine spring is dirty or worn. When looking at the two cartridges side by side, this difference is evident. The Jeffery was originally loaded with 535 grain bullets, giving the same sectional density as the Gibbs slightly smaller diameter 525 bullet, but I see that several custom bullet makers (eg Hawk) make heavier bullets for each.
    I think I have one more buffalo hunt in me, and I want to use a Gibbs, mostly for nostalgia......FWB
     
  4. matt85

    matt85 BRONZE SUPPORTER AH Fanatic

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    spike.t, all the more reason to ask the question and hope at least one or two people have tried them.

    flatwater bill, thanks for the info. just from looking at pictures of the two cartridges side by side I can tell the Gibbs has a sturdier built case which looks more suitable for reloading. the only real downside I can see to the Gibbs cartridge is the odd bullet diameter. thankfully Woodleigh makes both softs and solids in 525gr and 600gr for the 505 Gibbs so there are available options out there.

    thanks
    -matt
     
  5. flatwater bill

    flatwater bill AH Senior Member

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    Matt.................if all you can get is those worthless Woodleigh bullets than there is a REAL problem.........................................................Of course I am joking...............if you have Woodleighs for your rifle, you need not look further, They are what I will use if I ever pony up for that double square bridge magnum Mauser 505........................FWB
     
  6. colorado

    colorado AH Enthusiast

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    I went through the debate and bought (really had built) a 500 Jeffery on a CZ 550 action. It started out as a 375 H&H and I had Harlan at Triple River Gunsmithing (they do most of the CZ USA Custom Shop work) rebarrel it. It needed a bit of work to get it to feed and function flawlessly but it was worth it. I really like the 505 Gibbs, but I think the CZ bolt face's diameter is too small for the cartridge. The cost of having one built from scratch was beyond my budget. I've loaded the 570g TSX up to 2510 fps, but at 2300 fps it's a lot kinder to my shoulder and will still kill anything that walks the planet.

    [​IMG]
     

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  7. matt85

    matt85 BRONZE SUPPORTER AH Fanatic

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    thats a very nice looking CZ!

    -matt
     
  8. Velo Dog

    Velo Dog AH Fanatic

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    Matt85,

    I agree that the Gibbs case probably lends itself more readily to reloading, and the full width "rim" is potentially more reliable for feeding, not to mention that it was designed to operate at lower pressure than the Jeffery was - a definite plus in tropical climates.

    However, I went with the .500 Jeffery instead, due to projectile availability.
    .510 - .511 diameter bullets are available from lead round ball through 600 gr JSP and FMJ Woodleighs, at least.

    Currently, I am having mine extensively worked over to ensure reliability, rebated rim and all.
    It has been a frustrating adventure but in the end, I am confident that it will be quite a fine DG rifle (but not cheap).

    With it, I should be able to shoot reduced loads with cast or swaged lead bullets, otherwise intended for the old and many black powder .50 cartridges.
    Likewise, I should be able to shoot full power 570 grain bullets otherwise intended for the .500 Nitro 3", not to mention the classic 535 grainers originally intended for the Jeffery to begin with.

    Chomping at the bit to get it all going.
    The Gunsmith recently called me to say that it is now feeding well.
    Can hardly wait to fire it soon.

    Cheers,
    Velo Dog.
     
  9. matt85

    matt85 BRONZE SUPPORTER AH Fanatic

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    I do like the Jeffery for bullet availability. but the more I think about it, the more I like the 505 Gibbs. mostly for case design as reloading cartridges with thin/weak rims is a serious pain in the butt. full length sizing my 500/416 NE brass is a delicate task and I have destroyed a handful of very expensive brass by not being careful enough. 500/416 NE brass has a very thin fragile rim which will pull off easily in a press.

    you mentioned using swaged/cast lead bullets. I could always run .510/.511 bullets threw a .506 sizer to make them usable in the 505 Gibbs. taking off .005" is very easy and wouldn't even ruin the lube grooves.

    -matt
     
  10. Velo Dog

    Velo Dog AH Fanatic

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    Matt85,

    I hear you loud and clear amigo.
    And I agree the Gibbs is more hand loader friendly, due to the more generous neck length.
    Likewise, I am with you 100% on thin/weak rimmed cases being tedious to reload, I do not prefer them either.
    Truly, I did toss and turn over whether to get the Gibbs or the Jeffery for a long while.
    However, the Jeffery's rebated rim is neither thin nor weak, from all I have read about it and the cases I have for mine (both Norma empty brass and as well 10 Kynoch live 535 grain JSP) definitely appear thick and stout.
    Have not yet resized any though and I might be surprised yet.

    Need to get on it soon as my rifle is about to make it's triumphant return to my toy box, and therefore soon to the rifle range for function and accuracy testing.
    Your notion of swaging the .51 dia. bullets to .50 seems like an excellent plan.
    I have heard of people doing the same with jacketed DG bullets as well (but some serious leverage might be required for such heavily constructed JSP / DG types?)

    Cheers,
    Velo Dog.
     
  11. colorado

    colorado AH Enthusiast

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    I think bullet selection is pretty good for the Gibbs. You can buy Woodleighs, Barnes or A-Frames for the 505 Gibbs. Can't go wrong with that. If I could've afforded a GMA action I would've gone that route. Happy with what I have though. Best of luck either way you'll be part of the "50 club"

    :)
     
  12. Velo Dog

    Velo Dog AH Fanatic

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    Namibia (1), South Africa (3) & USA (most Western States, including AK & HI). Too bad spear fishing is not called "fish hunting" or, I could add a few extra countries (couldn't resist weaving that in somehow, sorry).
    I didn't realize A-Frames are now being made in .505 Diameter.
    That is excellent news.
    I did however know that Barnes was making .505 bullets (Likewise, I have some .510 Barnes monolithic solids in 235 grain for my Jeffery, just in case I decide I need to damage an engine block or if I ever get drawn for a brontosaurus tag someday.

    Also, on this .500 & .505 topic, you were correct (as I knew you were) regarding having to re-work the follower in the CZ .500 Jeffery.
    The Gunsmith here re-shaped mine with his milling machine and also after a bit of hand filing the rails, now reportedly my bazooka is feeding like a pig.
    Likewise, he had to address the short / tight chamber as well but evidently that was the easy part.
    Blah, blah, blah,
    Out.
     
  13. colorado

    colorado AH Enthusiast

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    Good to hear your rifle is working well. Every big bore we have including a stock Rem XCR II in 375 H&H and a M70 Classic CRF in 416 Rem have needed some touch up work to make the feed and function flawlessly. They have all been worth it.

    :)
     
  14. Velo Dog

    Velo Dog AH Fanatic

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    Thanks Colorado.
    Also, I guess I have been lucky since all factory rifles I have ever bought or traded for, new and used but mostly used (quite a pile of rifles over my lifetime) have fed and chambered properly.
    Someone said that it is better to be lucky than good.
    However, it looks like my luck ran out when I bought my brand new CZ so called "Custom Shop" 550 Magnum in .500 Jeffery.
    Oh well, I did learn a huge lesson from my expensive error, IE: It was in my foolishly presuming their so called "Custom Shop" really was one (the joke was on me that time for sure).
    My best,
    Velo Dog.
     

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