help on 505 Gibbs

[Bullshop]

OK friends ol Bull Shop needs help and thats no BS. Just took on a project to work up a boolit load for a 505 Gibbs.
He wants a 510gn boolit at 1800 fps or there bouts. I cant find much info to start with.
I did find a formula for AA 5744 but the small amount I have on hand will go up in the first few shots. Resupply is 130 miles away in Fairbanks.
I have some ideas pulled from the far recesses of my mind but nothing anyone has already done.
If I must venture into untroden ground then so be it, damb the torpedoes full speed ahead.
If anyone has already venture through this mine field could ya lay out the rout for me, least I set one off?
BIC/BS

[45nut]

Have you any H 870? Anything in that burning rate range? I use it for plinking loads for my 500A2.

[only1asterisk]

Case full of Hodgdon 4831. 130 gains or so.

David

[obssd1958]

Bullshop,

PM IdahoSharpshooter - he has worked with the 505 Gibbs and the 550 magnum. Nice guy, might even have a boolit or 2 to suggest!

Take care!

Don

[jtaylor1960]

I found a few loads with modern powder you should be able to find easily.These loads are all with a 525gr. bullet .119gr. of IMR-4831 2,100fps.( estimated).IMR-4831 130gr.2273fps.100gr. IMR- 4064, 2060fps.This comes from Big Bore Rifles and Cartridges by Wolfe Publishing and should be a reliable source.That should be a fun gun to experiment with .Good luck, Jeff Taylor.

[frank505]

I use WC 860 in mine, 120 grains will give you about 1900 fps. I have some data with Reloader 15 which needs a filler and I just don't like fillers. Reloader 22 or 25 will about fill the case and give RELIABLE ignition with Federal 215's. Reloader 25 at 125 grains will do about 1800, but velocity variation is too much. I have not tried IMR 7828 or any other slow off the shelf powder.
My normal working load is 140 grains of WC 860 and a 600 grain gas check for 2200 fps. There are no blood trails...............

[Bullshop]

Praise God the cavelry has arrived. This is all good stuff, and I have most everything mentioned for powder. A fine bunch ya are a fine bunch indead! Many thanks!
BIC/BS

[charger 1]

Lookin to late but I sent your contact info to a fella on another forum that goes by 505 gibbs cause its his pet. Told him to send you some stuff

[hollow-point]

bullshop, once had a 505 m17 26 in barrel . had custom mold 525 gn . looking back on notes: imr7828 135 gn-1900 fps...

[hollow-point]

also can use winchester wxr and one of the hodgdon powders which is made here and sold here as ar 2213sc. ican go further if you need.

[Bullshop]

Gents, as some of you prolly expected I am back for help again. I got the mold, a three cavity from NEI for thier 550gn RNGC and its a humdinger, a real nice lookin boolit at close to 600gn in WW. I have fed 215 primers and lots a powder, so far so good. Now just as I was getting myself all syked up about shootin this thing I found that the C&H dies are fat,like really fat, too fat to fit a standard press.
What to do? Somebody must make an adapter for the rock chucker if the old RC is tall enough??? What is yall fellas usin to load with? I hadnt looked at them dies till I was ready to load but fat as they are they are real nice dies. Somebody shoulda told me, now dont I feel silly. Maybe at least I can rig up a seater for one go round with a farm hand. After that I wont be able to size um again so guess I will just have to toss them $5.00 ea. cases. Maybe that homongus Herters press will save the day, hope it shows soon.
BIC/BS

[leftiye]

Ya need to open up your press to the thread on those dies and then make an adapter down to 7/8X14. My C&H has a thingie that screws into the frame and is 7/8X14 i.d. looks like it can screw out and either fit or be replaced by another adapter. I know that's not much help maybe. You might look at the 50 BMG presses and see if they're that thread (whatever those dies are) maybe.

[frank505]

Yes, you are now in the 505 world. The CH 4D dies are 1 inch thread and I forget the pitch. The insert in a Rockchuck press will unscrew and you should have the correct hole and thread pitch. Otherwise you need a new press. I bought a CH press that works well.That NEI bullet is good for shooting rocks and such but I would not trust it on game. My mold was made by Hoch and casts a 600 grain flat nose gas check which is hard on things. It is a little undersize and should have been made to cast a .512 diameter bullet so as to be more useful.
I can send some bullets of mine when I return from two weeks of buffalo hunting and using the Gibbs as a backup rifle. The load will be 140 grains of WC 860, Federal 215, and the 600 grain Flat nose gas check with Carnuba Red. After shooting some of these, running a patch down the bore results in a little carbon, but mostly Carnuba Red on the patch. I guess the stuff works, Thank you Glenn and Leah!!!!

[Bullshop]

frank505
I did take the adapter out of the rock chucker but then the threaded hole in the casting is larger by a good bit than the dies. What it will need is an adapter that fits the press ID and the dies OD. I am wondering if C&H makes one for other than thier own presses.
I dont have the tools to make one, help Mr. Wizard (Buckshot) help!!! Tooter Tooter alvays I'm telling you'
drizzle drazzle drozzle drome time for zis von to come home.
Blessings BIC/BS

[Bullshop]

I just went to the C&H 4D site and found a press top bushing chart. OK I think I am on the right track. Now what bushing do I need??? These dies are smaller OD than the 50 BMG dies but larger than standard. I can measure the OD but not the thread pitch. Any suggestions?
BIC/BS

[frank505]

I will go home and measure the pitch on my dies. You can always call Dave Davidson at CH and ask. Be prepared for a looooong one way conversation though. I just remembered, I also make a 510 grain gas check for the 50 AK that could be sized to .507 and shot in a Gibbs. I may have some done up that way, I will look and report tomorrow am.

Thank you Frank

[Buckshot]

................Good thing I started that .504" push through die. I figured you'd be bugging for it before too much longer.

................Buckshot

[only1asterisk]

You can always call Dave Davidson at CH and ask. Be prepared for a looooong one way conversation though.

You got that right!

David

[frank505]

The 505 Gibbs dies from CH4D measure 1x14. My set has a large neck diameter, wish it was smaller and gripped the bullets tighter. Maybe need to call Dave when I have time...............
Let me know if you want some bullets to play with besides the NEI 600 grain round nose. I will be gone for two weeks, returning on the 10th of December with tales to tell of buffalo killing and bullet performance. It does get boring because we ask that our hunters use a cartridge

[Bullshop]

OK then with the help of Frank505 and NVCurmudgeon I am getting close. If I have this right the threaded diameter of the rock chucker casting without the steel bushing is1.25" but I am not yet sure of the pitch. The thread diameter if the C&H dies is 1" with a 14 tpi pitch. So I nee a bushing with an OD of 1.25" with a ? tpi prolly 14 and an ID of 1" with a 14TPI. Wow thats easier to think than to wright. Ok with this I shall return to the C&H chart fully(almost) prepaired for battle. CHAAAARRRGGGEEE!
OH and I almost forgot, BUCKSHOT its not a 504 its a .507"/.508", please get it right. Sometimes you scare me.
BIC/BS

[frank505]

We ask our hunters of the great and tasty buffalo to use a cartridge that starts with the number "4". This, of course angers the high velocity bunch but buffalo are not impressed by velocity. They are impressed by diameter of a bullet and placement of the bullet. Even the 41 Magnum revolver will kill a buffalo(900 pound heifer) but please don't tell us stories of the fabulous 3000000000 super stupid idiotic mangle'm that you can't place your shots with and then the bullet fails on the hide. I've heard a story of the 300000000000000000000000000 mangle'm in Nebraska on a buffalo, it was not pretty or humane. Too bad the buffalo wasn't able to teach a lesson to the idiot. Someone else told me a story of three guys with what they thought were "big guns" and a pissed buffalo. Seems they ran their 300 magnums dry and barely got it killed before it got to them. Hmmmm, maybe something bigger is in order for 900 pound animals, like a 45/70 and Elmer Keith's load of 53 grains of 3031 and a 405 gas check, fairly hard.

[Dye]

OK then with the help of Frank505 and NVCurmudgeon I am getting close. If I have this right the threaded diameter of the rock chucker casting without the steel bushing is1.25" but I am not yet sure of the pitch. The thread diameter if the C&H dies is 1" with a 14 tpi pitch. So I nee a bushing with an OD of 1.25" with a ? tpi prolly 14 and an ID of 1" with a 14TPI. Wow thats easier to think than to wright. Ok with this I shall return to the C&H chart fully(almost) prepaired for battle. CHAAAARRRGGGEEE!
BIC/BS

Bullshop
The outside of the rock-chucker bushing is 1.25 x12 tpi,the C&H should be the same.

Becare full Dye

[45nut]

My CH4D 500 A Square dies are all 7/8-14, that really helped between deciding on a 500A2 and a 50 BMG. No special primers, no extra equipment to buy just for the bmg, and I can use 50bmg pulled bullets as well as my own cast. Add in the powder economy savings and it was a simple decision. And I get 88% of the bigger case with 1/2 the powder appetite.

[Idaho Sharpshooter]

better late than not at all. My 505 Gibbs is a CZ with a 24" barrel.

I shoot a 650gr RFN GC bullet with 120gr of N160....2096fps. The same charge of AA3100 shoots about 1981fps. I load them to 3.90" and they fit in the magazine and feed great. If he is a glutton for punishment, I have gone as far as 140gr of the AA3100...but that load feeds on both ends...2450+fps. I believe a 600gr round flatnose or truncated cone gas-checked bullet at 2350fps will be about optimum for the 505, based on about one hundred rounds of the bullets I have tested.

Rich

[Bullshop]

IS
What kind of brass are you using, what are you sizing boolits too? This is also a CZ. I have slugged the grooves at .5067". I have tried to chamber a round with a .509" boolit seated in HDS cases and they will not go. That dont leave much room for eror in the neck of this thing. I am waaaaiiiitttiiinnnggg for a sizer from our beloved lil ol die maker Buckshot and hoping for something between .507 to .508". I am really hoping I dont run into a situation here that I often see with old Winchesters in that they will not chamber a groove diameter boolit.
Blessings
BIC/BS