.505 Gibbs

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Last Post 27 April 2016

CBA Member

det posted this 05 February 2011

While at the SCI Convention I got a factory CZ 550 chambered for .505 Gibbs. I have dies and Jamison brass on order. Does anyone have cast bullet data for the cartridge? My first thought was an LBT LFN gascheck at 525 grain weight.

Det

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CBA Member

6pt-sika posted this 05 February 2011

I load for a CZ550 in 505 a friend owns .

But he doesn't wanna shoot cast . So all I've loaded for him so far has been the Barnes 525 TSX bullet and 130 grains of RL-22 and a Federal 215 primer .

My friend has a three gun battery for hunting HOGS in Arkansas . His light rifle is a CZ550 in 375 H&H , his medium rifle is a CZ550 in 416 Rigby and his heavy hog gum is the aforementioned 505 Gibbs !

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CBA Member

Brodie posted this 05 February 2011

6ptSikta, as an individual who has spent a lot of time behind a .459 Win. Your friend

must be a little rattled to say the least.

The only hog hunter that the guide Nesson Schmidt in King City Ca. ever had come up with a total blank on hogs was using a .378 Weatherby, and fired three boxes (60 rounds) for no pig. I hope your friend has a better average.

As for the 505 Gibs I would suggest a cast bullet of apropiate diameter and weight -gas checked if possible-and using starting loads with the jacked data.\

Good Luck

B.E.Brickey

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CBA Member

6pt-sika posted this 05 February 2011

Old Coot wrote: 6ptSikta, as an individual who has spent a lot of time behind a .459 Win. Your friend

My friend is a little unusual I will say that !

I've been a rather long time shooter of the 375 H&H and the 416 REM MAG myself but thats about where I draw the line anymore . My present 375 and 416 are both on Ruger #1H rifles . Had a 1H last year in a 458 WIN MAG and that thing would kick the fire out of you with a 400 or 500 grainer loaded to factory specs ,

I've shot the 505 both offhand and from the bags and it is a handfull although not unmanagable .

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CBA Member

6pt-sika posted this 05 February 2011

Old Coot wrote: .

Last year he killed 3 hogs with 2 shots using the Gibbs . Then he got a couple others with his 375 H&H as well .

This year he blooded the 416 for the first time taking 3 I think .

Actually he and another friend are on the way back from AR as I write this . They took 7 piggies this trip . My friend that owns the 505 got 5 of them and our other friend took a pair !

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CBA Member

Brodie posted this 05 February 2011

That beats me. The biggest thing I ever killed with that 458 was a jack rabbit and I didn't even hit him. The 479 gr. cast gc bullet hit the sand below his sternu while he was running and he flipped up in the air about 2ft. I could find no bullet hole so I skinned him and found a huge bruise on the bottoom of his chest. I guess I “barked” or “sanded ” him.

Those cannoons will definately do the job IF spend the time and components to get used to them so you can hit. Otherwise, they fust throw a lot of lead at a time.

B.E.Brickey

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Standard Member

cityboy posted this 05 February 2011

Which end of a 505 has that most killing power?

Jim

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CBA Member

Brodie posted this 05 February 2011

Whichever end you come into contact with upon ignition!

B.E.Brickey

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CBA Member

6pt-sika posted this 06 February 2011

cityboy wrote: Which end of a 505 has that most killing power?

Jim Actually the 505 recoil isn't that rough , well not like a 375 Ultra . The 505 is more like a BIG shove then a sharp crack !

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CBA Member

6pt-sika posted this 06 February 2011

Old Coot wrote: That beats me. The biggest thing I ever killed with that 458 was a jack rabbit and I didn't even hit him. The 479 gr. cast gc bullet hit the sand below his sternu while he was running and he flipped up in the air about 2ft. I could find no bullet hole so I skinned him and found a huge bruise on the bottoom of his chest. I guess I “barked” or “sanded ” him.

Those cannoons will definately do the job IF spend the time and components to get used to them so you can hit. Otherwise, they fust throw a lot of lead at a time. I've only killed one wide 6 point whitetail with my 416 REM MAG and a couple whitetail slicks with the 375 H&H MAG . Nice clean holes in and out !

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CBA Member

Brodie posted this 06 February 2011

cityboy wrote: Which end of a 505 has that most killing power?

Jim

Recoil is a function of Momentum or what goes out comes back at you.

Felt recoil is a function of Acceleration, or how fast the bullet gets from zero fps to whatever it is coming out the front. If the same bullet is fired with a faster powder there will be more felt recoil. This is easily apparent in the 375 HH, 458, 505 etc. A load I had that gave a 500 gr cast or jacketed 458 bullet 1900 fps for example hurt a heck of a lot more when loaded with IMR 4198 than 3031 or 4895. There is a mathmatical proof for this (I did a paper on it in physics), but typewriters are not keyed for math. My guess is that the 505 G is more of a big push than anything else. A friend of mine had built a single shot 50 BMG rifle, and happily sent stuff down range with it, but would not shoot a 338 Win because the FELT recoil was so bad. Something that I agreed with.\

Brodie

B.E.Brickey

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CBA Member

M3 Mitch posted this 27 April 2016

On these big rifles the weight of the rifle itself can be a big factor in felt recoil. I would expect that this .505 weighs 10 lb or more, that helps reduce recoil velocity, so as said one feels more like a push than a punch.

One of the most obnoxious kickers I have encountered is a 300 Weatherby with full power 180 or 200 grain bullets.

Getting back on topic, Hodgdon's online manual does not have loads for the 505. I would think that cast loads for a 500 Nitro Express, since the 505 is a bit bigger bullet diameter, I think the 505 brass has more capacity and a higher maximum allowed pressure - all this makes me think it would probably be OK, but, I'd check that out before acting on it!

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.505 Gibbs

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