.505 Gibbs project

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.505 Gibbs project

Post by cracker » 19 Jul 2019, 3:04 pm

Just wondering if anyone had been down the path of having a large safari style type rifle built.

Got a bee in my bonnet for a .505 Gibbs.

At the moment my plan consist of finding a 2nd hand cz550 safari gun in 375h&h, 416 rig or 458win mag, how ever i would consider using a winchester model 70 as a base.

Having the barrel removed and fitted with a suitable .505 barrel, having the chamber cut and the bolt milled too suit... other details such has barrel band sling mount, re using the factory cz sights will also be on the cards, all carried out by a professional

thoughts/criticism welcomed.

Hopefully going to use bob from kudu in montross how ever i read something about him having health issues?

Replacing the stock with something from hatchers perhaps and adding a recoil reducer to the stock, not a huge priority as the cz stock while being abit ugly should work...and i dont mind the model 70 stocks, any other stock manufactures that people know of?

Aiming for around $3500-$4000 in total on the gun its self which i think should be fair... figure 1500-2k for the gun 1k-1.5k in custom work.

Brass is available from bertram brass for just less then $150
Dies im trying to import from brownless u.s.a.. will see how that goes.... for $199 u.s d which seems very decent.

As far as a suitable press goes im at a loss... currently using a lee single stage but think it will be too small... as well as the .505 dies not fitting and requiring a different bush? no idea...

Any input would be great, im sure others have been down this path, or have better suggestions or thoughts regarding the matter.
cheers.
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Re: .505 Gibbs project

Post by Bill » 19 Jul 2019, 3:18 pm

Why the 505 Gibbs??

Are u sure u can handle it.....
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Re: .505 Gibbs project

Post by duncan61 » 19 Jul 2019, 5:13 pm

525 gn bullets WOW
.22 winchester .22hornet .222 .243 7mm rem mag cbc 12g
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Re: .505 Gibbs project

Post by cracker » 19 Jul 2019, 5:29 pm

Bill wrote:Why the 505 Gibbs??

Are u sure u can handle it.....


ethical was of culling rabbits ?
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Re: .505 Gibbs project

Post by cracker » 19 Jul 2019, 5:30 pm

duncan61 wrote:525 gn bullets WOW

600s are on the cards too, case capacity is huge
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Re: .505 Gibbs project

Post by Bill » 19 Jul 2019, 7:26 pm

Cracka I handle 1 of the original 10 505 Gibbs imported over a decade ago and I told myself I had to have one lol, then the years went past and I decided that a 458 Lott would be a much more practical build/acquisition. Anyway stroke of luck but I now have a 500 A square CZ550 in the safe and its a hoot to shoot, well the mild cast lead loads are....

Ive got some betram projectiles and load data to stoke it up but I must confess Im not real keen on testing a full house load lol.
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Re: .505 Gibbs project

Post by SCJ429 » 19 Jul 2019, 7:29 pm

Sounds like a very sensible choice, I don't have one but shot a 505 built on a CZ550 action built by Group Solutions I think. You do have to hang onto it but it is a nice plinking rifle.

Your budget sounds about right, I built a 50 cal on a Winchester M70 action, RUM and I didn't get any change out of $4,000.
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Re: .505 Gibbs project

Post by cracker » 19 Jul 2019, 7:59 pm

Bill wrote:Cracka I handle 1 of the original 10 505 Gibbs imported over a decade ago and I told myself I had to have one lol, then the years went past and I decided that a 458 Lott would be a much more practical build/acquisition. Anyway stroke of luck but I now have a 500 A square CZ550 in the safe and its a hoot to shoot, well the mild cast lead loads are....

Ive got some betram projectiles and load data to stoke it up but I must confess Im not real keen on testing a full house load lol.


what dies in what press do you use?

allready have a 458lott in a cz550, pretty standard but it still makes me smile from ear to ear.
500A square would be nice as well, or even keep going, but iv fallen in love with the history of the .505, mild and work your way up haha, 79grains off ar2008 was fun with 500g solids in the 458lott, 80grains was getting there and 81g started to just hurt - whats not to love !
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Re: .505 Gibbs project

Post by cracker » 19 Jul 2019, 8:02 pm

SCJ429 wrote:Sounds like a very sensible choice, I don't have one but shot a 505 built on a CZ550 action built by Group Solutions I think. You do have to hang onto it but it is a nice plinking rifle.

Your budget sounds about right, I built a 50 cal on a Winchester M70 action, RUM and I didn't get any change out of $4,000.


yeah thats the idea abit of plinking, think the 550 is a decent action tot start with, model 70 at the right price would get the nod too, not sure what else will work with such a large case
what dies and press are you using to load your .50cal ?
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Re: .505 Gibbs project

Post by SCJ429 » 19 Jul 2019, 8:26 pm

The rifle is chambered in 500 MDM and is based on the RUM cases. Dies came from the US manufacture SKS Industries. I can load it on a standard press.

Your other option is to use the Weatherby Mark 5 action and go with the 500 A Square like Bill. I was contemplating doing this to a 460 Weatherby.
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Re: .505 Gibbs project

Post by cracker » 19 Jul 2019, 8:38 pm

SCJ429 wrote:The rifle is chambered in 500 MDM and is based on the RUM cases. Dies came from the US manufacture SKS Industries. I can load it on a standard press.

Your other option is to use the Weatherby Mark 5 action and go with the 500 A Square like Bill. I was contemplating doing this to a 460 Weatherby.


.460 weatherby would be ace as well, but its not a 50cal... i was keen on a .460 until i saw the .505, think the .460 would be a better round in basically every way... tones of 458 projectiles about, i think they start to get torn apart though... like the hotter 458 lott rounds do, eg if you load 45/70 proj.
struggling to find anything about 500 mdm without digging threw some books.
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Re: .505 Gibbs project

Post by Bill » 20 Jul 2019, 11:56 am

Cracka my 500 came with some handloads, 95gr under 570gr of lead, were meant to be doing 1900 but labradar has em doing 2050fps.

I was going to up the powder to 110-115gr with the Bertram 570gr cup n cores which should be approaching 2200fps, should be enough. 130-134gr should have em doing north of 2400fps :lol:

I also grabbed some 440gr Bertram pills, quickload show a top load around 2850fps :wtf: :lol:
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Re: .505 Gibbs project

Post by marksman » 20 Jul 2019, 12:35 pm

the 505 gibbs is more than I can handle
after having two shots of one I gave the rifle back to the really good bloke owner, thanked him then told him I didn't think it was fun :lol:
he laughed at me as I held my head while my brain stopped banging around in my skull :lol:
it is truly a big handful :wtf: I am impressed with the guys who can handle and shoot accurately this type of round :drinks:
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Re: .505 Gibbs project

Post by Bill » 20 Jul 2019, 1:35 pm

I hear ya marksman, 3 rapid shots of even moderate loads sure do shake up the brain.

My 500 was built on a 375HH so only 10.25 lbs so at the lighter end of what would be tolerable.
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Re: .505 Gibbs project

Post by cracker » 20 Jul 2019, 2:23 pm

Bill wrote:I hear ya marksman, 3 rapid shots of even moderate loads sure do shake up the brain.

My 500 was built on a 375HH so only 10.25 lbs so at the lighter end of what would be tolerable.

think your 500 would have abit more horse power then the .505gibbs but an interesting starting point non the less thanks for the reply.
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Re: .505 Gibbs project

Post by SCJ429 » 20 Jul 2019, 3:00 pm

Bill wrote:I hear ya marksman, 3 rapid shots of even moderate loads sure do shake up the brain.

My 500 was built on a 375HH so only 10.25 lbs so at the lighter end of what would be tolerable.


I like a heavier rifle, heavy barrels and some lead on the stock helps. They are OK to shoot off sticks or leaning on a tree but sighting in at a bench is a chore. I always come back home with a headache from the concussion even when shooting a 460 or 416 from the bench doing load development or sighting in.
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Re: .505 Gibbs project

Post by Bill » 21 Jul 2019, 10:51 am

cracker wrote:
Bill wrote:I hear ya marksman, 3 rapid shots of even moderate loads sure do shake up the brain.

My 500 was built on a 375HH so only 10.25 lbs so at the lighter end of what would be tolerable.

think your 500 would have abit more horse power then the .505gibbs but an interesting starting point non the less thanks for the reply.



Not sure cracka but I would have thought if you Stoke up the Gibbs then you could match nd exceed the higher pressure 500 A2
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Re: .505 Gibbs project

Post by bigpete » 21 Jul 2019, 11:02 am

525gn ain't that heavy lol
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