585 HE -- Cases In Production --

[hubel458]

Here is picture of 585HE in a Montana Rifle Co. PH action.
The double stack mag for the 505 Gibbs they make works ok.
The Enfield in the Hogue stock above is done and gone.



We also had guy show us how the case can work for a
high energy subsonic, real high energy for subsonic
1600 gr at 1050 fps. 400 ft lbs. The 585HE Whisper
Anyone with some way overbore 14.9 mm necked
cases on huge actions, can make case inserts for
using our case to fire subsonic And still fire 650gr or 750 gr
at high speeds. Can't get 14.9 Russian cases, use ours in
same gun with inserts.




Break action I like, we did on a CBC by mono-blocking a 585
barrel, set up especially for Minie bullets of 440 to 540 gr.

[hubel458]

You can see from above posts I like Enfields and here is picture
of how we set up action for long case and a singlestack magazine.
We open bottom of action for length and use a lip type magazine
insert to feed cases single stack. And lips are springy so we
can load from the top.



Here is the second gun I did years ago in the 585HE, an old style
Ruger 77. And at that time I used the cases I made myself and
they work great in the gun, high pressure loads, and extracted
easy like the new ones from Bertram.



Here is some math to show why I really like really big bores.
There is term called Average Barrel Pressure, which is the average of
all the pressures in a barrel, from the start where you have highest,
called peak pressure. to the lowest at the muzzle when bullet exits.
For high powered rifles average barrel pressure run 15-18000 psi.

There is a formula that can be used to get Average barrel pressure
fairly close if you know the muzzle energy.

We multiply ME times 12 and divide by barrel cross section x length.
We simplified it to get the 12 figure, It is inverse of the bore dia x 5
For the 585 it comes out about 10

Example a 458Win usually loaded to 5000 ft lbs, say in a 24" bbl.

ABP = ( 5000 ft lbs x 12) divided by (.17 sg in x 24") = 15,000 psi

Now you see there isn't a lot of room for big gains, as it would take
peak pressures damaging to brass and gun, to get say 50% increase.

Now example of 585HE in the 26" bbl we like, say a 7,000 ft lb load,
a real moderate load in this case. Could use 10 in place of 12,
but kept it all simple

ABP = (7000 ft lb x 12) divided by (.27 sg in x 26") = 12000 psi

The bigger bore allows for a much larger potential,
a 50% gain is easy to do.Ed

[hubel458]

Here is a few of the variety of bullets we found or know about, we
can use in 585HE, about a third of them, from 440gr, to 750gr,
to 1200gr, to 1600gr.



Here is picture of what 200gr powder, in a case that had
the powder settled, looks like.



We now have more 585 new straight blanks giving a total of 9
basic blanks, with long ones for guys setting up target guns.
And a bunch more of the profiled barrels are being made now
to go with new ones we got left. One which went on this BBK
pictured, 3 on Enfields, one on FBW, one Ruger, 2 in PHs.
Guys have used 5 of the new slow twist barrels. Ed

[hubel458]

There is a guy and his smith in AUS that has a reamer for the 585HE.
And maybe another firm there that can get a bunch reasonably priced
barrels imported in from the US. Our Mcgowen barrels are high quality,
hand lapped, and only half of what getting them in from other places cost.
Here is part of stuff that the guys have to work with..



Here is picture of the Mossy 390 action, after I'd set up for the 585HE.
Just to see how good the action is, and I have since set barrel back
and made it into a 24ga FH. Just makes an easy to work with test gun.
Being both use same size bore, and in 24ga with 3" chamber I can use
577 brass for 24ga cases, using same Minie and jacketed as 585HE.
58CAL IN ALL FORMS is where it is at, so to speak......Ed



PS-We have longer barrels now for target work including real heavy ones
of 1 5/8 inches, that some guys are working on getting bigger actions
set up to use them in. .