I am thinking of to build a .500 a-Square out of my mark v .460 wby
But I have been Reading old topics here on the forum about the .500 a-Square loads.. and it looks like 2500 fps with a 570 grain woodleigh is about max??
and a 600 grain woodleigh at 2400 as a max load.

I load my .460 wby to 2600 fps with a 500grain bullet with 122,5 grain norma 204 powder. And the 550 grain woodleigh does 2500 fps with the same charge of powder.
So how its it possible the .500 a-square max is 2500 fps with a 570 grain bullet when the .460 does 2500 fps with a 550grain bullet?? not much difference.
So my question is from you that own or have owned a 500 a-Square.. what velocity do you get with 570 & 600 grains bullets? how about the 535 grainer??

And when I am Writing here I would like to know.. is the 500 a-Square more powerfull than the .500 Jeffery??
Blaser does nice rifles in the .500 Jeffery.
//Overkill

quote:

And when I am Writing here I would like to know.. is the 500 a-Square more powerfull than the .500 Jeffery??
Blaser does nice rifles in the .500 Jeffery.

Swede,
Many of large bore cartridges are loaded far below their physical potential. For example, the Jeffrey is typically loaded to under or close to 7000 ftlbs., but it can easily go over 8000 ftlbs. See the data by Real Guns: http://www.realguns.com/loads/500jeffery.htm.

There is a nice article, too, part 1 (156) and part 2 (157):
http://www.realguns.com/archives/156.htm
http://www.realguns.com/archives/157.htm

There is a lot of good information in the articles.

My viewpoint is that one should build what one will use. If you will use 8000 ftlbs and more, then either the Jeffrey or A2 are for you. If you will end up using a 7000 ftlb load, then I would recommend the 500 AccRel Nyati.

That was an interesting article.. thank you 416Tanzan.
The .500 Jeffery looks good..
But I still wonder about how it is possible that the .500 a-Square cant get out more Power than just a Little Little bit more than the .460wby

I remember from the past when I was very Active here on the forum that the .500 a-Square was one of robgunbuilder´s favourite big bore. If you read this rob it would be very nice to hear what you say about this.. I Think you if anyone should know what the .500 a-Square can do
//Overkill

quote:

But I still wonder about how it is possible that the .500 a-Square cant get out more Power than just a Little Little bit more than the .460wby

It can.

If you load the 500 A2 to the same pressure as a 460 Weatherby, the 500 will have considerably more energy. However, published data on the 460 Weatherby is often loaded to a true max at a pressure that is avoided by others and for other rounds. It all depends on the pressures that you are willing to tolerate.

Another item is the amount of parallel freebore. Weatherby often has considerable freebore. But rounds in the .510" range typically build in some freebore, too.

What you're failing to take into consideration is the effects of the increase in bullet diameter and frontal area that you achieve in going from a .45 to a .50. I haven't had the opportunity to witness the difference on dangerous game myself, but the general consensus of those on here that have, is that an increase in frontal area and diameter do in fact make a difference on game.

The Jeffery does have an edge in capacity over the A2, but is typically loaded to lower pressures, as previously mentioned.

Per the governing body, The A-Square Co., Inc.,
.500 A-Square maximum average pressure allowed is 63,860 PSI by the Piezo PSI method.

The A-Square manual shows a 500 A-Square load that was judged to be just a wee a bit excessive at 64,000 PSI:

600-grain A-Square Dead Tough bullet
Cartridge case: A-Square make
Primer: CCI-250
117.0 grains H-4895
2527 FPS
26" barrel
1:10" twist
.510" groove
.500" bore
8 grooves
groove width: .142"

Another load shown (only powder charge changed) was 115.0 grains H4895 >>> 600-grainer @ 2474 FPS and 61,600 PSI: APPROVED LOAD

Above would be good information for calculating bore cross-sectional area for QuickLOAD prediction and see how close you can get,
for all you QuickLOAD Geeks out there.

The A-Square manual is a great book, a MOST RELIABLE source on the 500-A2,
but powder lots, brass cases, bullets, and primers may vary.
There may be a faster, yet safe load for the 500-A2.
600-grainer at +2600 fps might be possible with other powders, bullets, primers,
and using the brass like used in 460 Wby factory loads (Swedish, Norma-made, excellent) necked up.
BORE LAW always gives a ballistic advantage in horsepower to the bigger bore.
That is undeniable.
Whatever the 460 Wby can do in KE, the 500 A2 can do better.

That said, I have had pierced primers and sticky extraction with some old Weatherby factory ammo,
loaded in Sweden, back when there was an elephant on the cardboard factory 20-round ammo box.
That was a 500-grainer at 2700 fps, supposedly, and it was excessive in my Weatherby factory Mark V Deluxe 460 Weatherby rifle.
Subsequent to that, factory ammo quit claiming such high velocity.

Thanks for all the info..
But even if the .500 jeffery has more capacity than the 500 a-Square can you get 2500 fps with a 600 grainer in it?
Wich one is the Winner??
No one here that have and use a 500 jeffery or a 500 a-sqaure that have test what is max in their rifles??
Fun to be back here again
There is no were so much knowledge on big bore´s than on the AR.
Sorry that my English sucks too..
//Overkill

I have a 500 a square rifle and have pushed it hard. With IMR 4350, I can get 2551 ft/sec with a 600 grainsp bullet. Still extracts easy. my barrel is a little shorter that 26".

My CZ 500 Jeffery has a 23" barrel, with a max load of H4350 under a 600 grain Woodleigh my best is 2450 fps

535's are 2600fps and my 700 grain cast I can get almost 2200fps but usually load them around 2000fps