12GA From Hell in a break action--

[hubel458]

I'm visister here and it's nice site.
Two others and I made a long brass 12ga case.
We made brass from bmg cases adding 12ga size rims.
We testing it in heavy barreled guns and
are getting huge energy levels.In a beefed up
Savage 210 we got 730 gr slug to 2900 fps.
Got a NEF chambered for long 3.85" case. And it
has beefed up hammer for bmg primers used in our case.
Got 2500 fps with 600 gr slug, cases eject out real easy,
8300 ft lbs from an NEF with 24 inch barrel. Dr Rob
Garnick in your state put one in a big Borchardt falling
block action with heavy barrel.Here is picture of the
Savage.Ed.

[Spiggy]

long ways from THR , howdy

[Fjold]

Even longer from AR

[Patriot]

Hi Hubel458,

I've been following your project on THR. An impressive project and cool as heck.

[Inside Joke] IMHO, the ultimate graboid gun. "Looks like you broke into the wrong ******* rec room...."

[ivanimal]

I want to shoot that bad boy!!!!

[hubel458]

Thanks fellows. A NEF Ultra 12 ga, Rocky Mtn Brass
for original three inch chamber, dies,
600 gr slugs(Dixies are good) and 4500+ ft lbs
is possible.I pass the idea around to get others
into the fun that Rob and I have.Ed

[Socal858]

holy crap that is a fine work of art

[hubel458]

Been testing IMR-4759. No ignition problems.
Ignition is instant with regular primers.
Don't need Blue Dot starter powder,
like we used with RE-15 and RE-7
to have reliable fast ignition.We did
plastic cases first.600 gr slug. I got a
nice working roll crimper attachment
for drill press for crimping slugs.
That sure makes it easy, and perfect crimp.
In 2 & 3/4 plastic cases with loaded
length of about 2.35 inches got to 80gr.
That's max as you must leave room for
about 3/8 wads or cushion wad. Some cases
may only hold 75 grains max due to
the case construction.Powder is less dense
than RE-15. 1650 plus fps in 24 inch barrel.
In 3 inch cases, loaded length about 2.6
inches, got to 95 grs max, 1800 plus fps.
Some cases may only hold 90 gr due to
case construction. Cushion is
a half inch felt wad or equivalent.
Both lengths start down and go up
if pressures allow. 60 gr short case,70 long.
This powder being faster than RE-15 you must
have a little cushion in the way of felt wads
or plastic cushion wads.With slower RE-15
a card wad works ok as powder started slower.
The powder burning must build pressure
to open crimp without a to high pressure spike.
This bulky powder with reliable ignition
is a winner.Then we tested 3" Rocky Mtn brass
cases, Got max load of 105 gr, and 1900 plus
fps. In few weeks will get the 4759 and RE-15
loads pressure tested.Ed

[Patriot]

How much does it cost to build the least expensive version? IIRC it was $6xx-8xx, which would be a steal for this type of performance.

[hubel458]

With the powder I just tested it is best for NEF with
3" chamber. Nef Ultra slug gun is 220-250 bucks, and
Rocky Mtn brass cases are 6 bucks each, and
can be reloaded quite a few times.For brass cases, steel dies.
Dies from Rcbs( they are supposed to have them) I don't know
as I made my own. And some recoil reducers or
lead in the butt stock and big thick recoil pad
on the stock. If you do 12ga reloading you can start out
with plastic cases and a roll crimping setup
for drill press from precision reloading for $13.Ed

[hubel458]

Found an O/U that would handle the 4759 3"
loads. It is the Zoli Z-Sport. Expensive,
all alloy steel construction, tested to
about 100k. That's not a missprint.Their
site shows testing at the Italian proof house
of 8000 bar.That's 7-8 times regular shotgun
working loads.Pic of action below. It handling that extreme pressure, means that other quality
O/U like Ruger would handle 4759 loads.Ed

[hubel458]

Hot damnn- Test Results of 4 plastic cases.
Rem high base 3" case, with 600 gr
Dixie hardened slug. Roll crimped with
crimper in drill press. All 4 loaded with
90 gr of 4759. We have a winner.
Average velocity of 4 -- 1938 fps
Average pressure of 4 -- 14, 575 psi.
tested with transducer test ing setup,
in 30 inch barrel,In my 24" NEF I got 1800+.
Cases fell out of his test chamber like they did out of
my NEF.And with some cases I can get in 95gr,
that I figured with my math would
have 15k psi.So my math and developement is
OK.And 4800 ft lbs, thats neat with plastic.
Tom says this load will do in any gun that handles
the 2 oz factory magnum goose loads
that test about 13,600 to 14,000.And 4759
will give slower time to peak pressure, thus
will be easier on cases than magnum goose loads
or the hot factory Buckhamer slug loads
I fired, that expanded cases as much or more
than our 4759 loads.Ed

[hubel458]

Buckhammer 3 "factory loads are 15k psi.
A 2.75 inch case with 80 gr of 4759, a thin card wad,
a 3/8 cushion lubed felt wad, when crimped is about
2.4 inches long, with 600gr Dixie slug. Based on
pressures recorded in previous post for 3 inch case
and 90gr of 4759, they will run about 13,400 psi,
and work through modern guns.Another load tested with
same bullet, 65gr of 4759, tested at same place
was 11,800 psi and 1640 fps. So you don't have
to put in my max loads, but go down a
little and use in modern guns that
are lighter than NEF so they don't kick so bad.But yet
you can get fairly good energy levels for big game, 3300
to 4000 ft lbs of energy.Ed

[SemiAutoSam]

Don't you want to keep your shoulders where there at ? OK I want one too but damm looks like a hawkin gun.

Whos selling them ?

I want to shoot that bad boy!!!!

[hubel458]

Pick up a heavy barrel 12ga 3" NEF Ultra slug gun,
and load up our 4759 loads we show above.Start with
80 gr of 4759, 600 gr slug,thin card over powder
and 1/2" felt wad for cushion, and roll crimp....That
will get you into the feel of big bore recoil without
going all the way to setting up a gun with our full length
brass super power case.Ed