Does anyone know where there may be some .505 Gibbs factory ammo in stock? A friend is looking for it but came up dry so far.

you could always call supieror ammo

Try MW Renyonlds in Denver he is a stocking Knyoch dealer. I think he had some 505 the last time I was in.
505ED

Galazan's http://www.connecticutshotgun.com seems to have Kynoch avail in both soft and solids (don't know that thier online inventory is correct)... only $20/round!

Sounds like you need to get your friend set up for reloading!

Try Westley Richards.

Superior is a good outfit but the last 505 I saw from them (earlier this year) was loaded on Bertram brass. The rounds would not chamber in a Champlin Custom 505. Other ammo would. The guy sent it back, got some fresh and it wouldn't chamber either. After that my Horneber new loaded cases would chamber no problem with the bullets and powder pulled from the Superior/Bertram stuff.

Just one experience.

quote:

Originally posted by 500grains:
Thanks guys. WR is sold out. Superior will load to order but that takes a while. Looks like Galazan's (CT shotgun) is the place.

I know a dealer with 4 boxes of 525 grain softs (A-Square Dead Tough) and 4 boxes of Solids (A-Square Monolithic 525 grains) collecting dust on his shelf.

CZ took A-Square back to the drawing board and they made some new ammo that now fits in the CZ rifles.

It is about 125 dollars US for a ten round box. And it is A-Square. Maybe they got it right this time?

I'm not a fan of the Kynoch either (the cases at least) - last batch I purchased was in 375 for a DR I had that was regulated wtih it.

8/10 of each of the case necks split on the intial firing. The split(s) was in the extreme end of the case neck where the crimp was placed - about the last 1/16".

New guy

Are you able to give me the manufacture date from the outer box of the cartridges upon which the necks split.

Are these current Kynamco manufactured or the much older (1970's)that Norma loaded for Kynoch, of these a number were known to split in the neck area?

I have used many hundreds of the current Kynamco .375's and have not as yet seen a problem with neck splitting.

Also how do they regulate in your double?

CZ had there rifles chambered too small. There contractor order one reamer for 1000 rifles. Yes, one reamer. I have personally checked a CZ chamber. It measured .6389...min. chamber is .6409. The A2 ammo in question was .638, which is max cartridge. The revamped CZ ammo measures .636....002 below max. I would say CZ's contractor dropped the ball on this one.

quote:

Originally posted by moonova:
CZ had there rifles chambered too small. There contractor order one reamer for 1000 rifles. Yes, one reamer. I have personally checked a CZ chamber. It measured .6389...min. chamber is .6409. The A2 ammo in question was .638, which is max cartridge. The revamped CZ ammo measures .636....002 below max. I would say CZ's contractor dropped the ball on this one.

Makes sense.
I did not measure any chambers.
This explains the quiet re-issue of sized down .505 Gibbs ammo by A-Square with CZ USA headstamp.

Thank you moonova.

And the beat goes on. Hoof beats of truth, muffled by CZ secrecy. The horse still lives.

I did pull some of the A-Square ammo apart.
The flash holes were so small and irregular that I was unable to de-prime the cases, giving up after breaking three pins and bending the stem of the die. Had to replace the stem of an expensive die.

I swore off the A-Square ammo at that point.

A-Square is not without fault on the .505 Ammo for CZ.

It appears that a Dave Manson Reamer will be required to CIP spec.

The CIP max for the .505 Gibbs head and rim is 0.6402, for the brass, not the chamber, eh?

The chamber should have some slop.

The CZ .505 Gibbs is a project gun on the way to .510 Tatanka.

grains...i liked the elephant shot better...

RIP

I stand corrected...cartouche maximale is 16.26 or .6402...I had to break out the book on that one. I agree with you on the flash holes. To my knowlege, they have corrected that problem. Art seems to like the small flash hole for some reason. My tests show that it raises pressures 2000 to 5000.

Moonova,
Glad to hear that the flash holes have been made large enough to get a depriming pin through. I don't know what the reason for a pinhead-sized flash hole would be in a .505 Gibbs other than just a boo-boo.

Would the pressure spike with the small flash hole be due to slow ignition and not enough force from the primer to get the bullet moving until "almost detonation" of the load within the case? I like a normal-sized flash hole and hot primers in the .505 Gibbs.

Note that I was able to reload some of the primed A-Square brass that I had pulled the bullets from. They sized down enough to chamber in my CZ rifle using the RCBS dies, no problem with full length re-sizing.

I reloaded with a light load of 100 grains of RL-15 and 5 grains of Dacron filler, and re-seated the A-Square "Monolithic" brass round-nose solids (good for plinking).

There were hang fires!!! Attributable to the undersized flash hole no doubt.

IIRC, the powder charges in the A-Square loads were something around 130 grains of an extruded powder that looked like a slow one such as H4381 long cut or RL-22.

I have to wonder if I had been able to chamber a round of the A-Square/CZ-USA factory loads: would it have gone off at all, or would the delay in the hangfire have been more noticeable than with the RL-15.

Anyway, the CZ .505 Gibbs chamber seems to show the proper shoulder angle and headspace on fired brass.

I note that 500 grains deleted a couple of posts from this thread, and now shows no disdain for the A-2 ammo. He was also hawking some A-2 rifles in another thread that made it sound like Art Alphin (AA, Mr. A-2 himself) was back at the helm instead of Jim Smith.

Maybe 500grains is now a spokesperson for marketing A-Square and will be wearing an A-2 T-shirt on his next elephant hunt?

Anyway, Art Alphin has made a great contribution to society with his excellent manual, Any Shot You Want, which is undoubtedly the best reading and most reliable manual for the big bores out there. He is an intelligent individual, and surely must make an excellent expert witness in any testimony regarding firearms and ballistics. Eventually A-Square will get it right, I reckon.

Cheers!

RIP, my scorn for A2 ammo may now be out of date as the reports coming forth are presently positive. Hopefully this trend will continue.

Cabela's in Buda, TX has two boxes of A2 ammo in stock for the 505.