12GA rifle From Hell--

[DogYeller]

Ed, has any one done any thing with the Mossberg SSI?

BTW; I look forward to your posts.

[hubel458]

No one that I know about. I've never seen one only
bad pictures. Don't know if it has a heavy bull barrel
like the NEF. If so it would do same loads.Ed

[DogYeller]

I bought one with a .223 and a slug barrel, just before Mossberg dropped the line. And I was just wondering if it would be a candidate for an upgrade.

[hubel458]

DogYeller- Ok, I like the style of them, what I could see
in pictures. If you tell me the exact outside diameter
of the 12ga muzzle, I can tell you what you can do and
how heavy you can load slugs for it. Glad to help.Ed

[hubel458]

Here is picture of RIP's two 12GA FH NEFs.
Both are the 12ga Ultra Slug Guns.
One has Vias brake, other expansion chamber.
He calls it his golf ball launcher. Ed

[hubel458]

I found a shotgun primer that will ignite rifle powders,
like RL15-19, IMR 4064,4198, etc. With regular shotgun
primers I had to use Blue Dot starter.
But not with these.....They are the industrial
shotgun primers used in the 8ga kiln gun cases. I use
these cases with basecup reduced in my 8 gauges.
When I set up first 8ga I fired the primers only to test
firing function(cases came with primer), then I put
regular 209 primers in to test loads, with 4759 powder.
Found box of WIN paper case kiln 3oz loads and took one
apart and noticed it had 94gr of some ball powder.
I wondered what powder is and how a regular shotgun primer
could ignite that, based on our need for starter powder
using regular rifle powders. So I fired that industrial
primer and flame and sparks came out of 8ga NEF barrel
2-3 feet. Put a regular primer in same case and flame
just a few inches. So I took REM kiln case with original
REM industrial primer and 2-3 feet of flame,and put regular
primer in and just few inches of flame. If anyone got
info on th powder used and how to get these primers,
let us know. I took some out of 8ga and put in 12ga plastic.
Using these hairy industrial primers today fired 180gr
of RL-15, in 12GA FH NEF, in 3.5" plastic cases with
437gr Brenekke KO slug. Got perfect ignition, no starter.
140gr with 600gr dixie, perfect ignition.
Also I have the 12ga Encore that we tested loads
in, on Gunbroker, in shotgun singleshot section.Ed

[hubel458]

I always felt that if some company would make powders like 7383
available it would be great. 7383 ignites fine with regular
shotgun primers in 12ga, but it is surplus and only a few of
us have it.It is a powder that has a lot of the deterrent inside
the of the material, not all near the outside like 99% of
all other powders whether spherical, tubular, or flake.
This allows easier ignition, but yet the deterrent still can
control the speed. Well the new RE-17 just out for 2 days
is setup like that. The surface of the RE-17 grains is
more porous than RE15, so that fact allows better ignition
even though a slower powder, and along with fact that company
got most deterent inside it still regulates speed.
Today I fired with regular REM and WIN primers in
plastic and RMC cases, a whole bunch of loads of RE-17,
with no hesitation or squibs or misfires. Loads ranged from
437 gr slugs to 750gr slugs today. All loads burnt clean
and I got in RMC case one of RG's 715gr jkt slugs to 2300
with 160 gr of RE-17. Using plastic you must have a strong
roll crimp with slug and wads tight.....Whoopee....Ed

[hubel458]

I shot couple loads with regular primer with RE-17
and 1040 gr slug in 12GA FH NEF, and it does great.
Tested loads that were cooled outside a while.Perfect ignition.
I fired loads RE-17 8ga plastic,in my 8GA FH on new NEF long
heavy barrel that was a 10 ga and RE-17 is great. No hesitation,
it fires off as good in 8ga as the 4759. Remember
I couldn't get good ignition in 8g with 4227, but so far
RE-17 is magic. In 8 ga all it would hold under the 8ga REM
wadcup with 770 gr slug is 200 gr of RE-!7, with the
wadcup pressed down, compressed real hard,good crimp,
and it really bellers.2400 plus.Going by case
expansion about 20k pressure. Which don't bother
those one piece compression molded super strong
8ga REM cases. You must have real tight proper
roll crimp in plastic cases and good tight
taper crimp or rolled in crimp in groove
in the brass cases. In RMC brass I size it so slugs
have to be shoved in with press.In all of this
brass and plastic, no airspace use wads when needed.

And this RE-17 doesn't break up the kernels when powder
gets to a certain point, like the 7383 does, causing burning
rate to speed up more than what it was designed for.
I tested 7383 in my 700HE, and when up to 35-40k it's
pressure went up fast, much more than linear progression.
I still like 7383 at shotgun pressures, but I really like
RE-17.Just great fun to use slower powder, so that
we don't have to worry about fast, high peak pressures,
but yet get large volumne, pressure curve for good velocity.

Ok- for those who want to get into the 12GA FH and get
the long strong 3.85 inch cases Rob on AR got some made,
email him to deal to get some- garnickrob@aol.com
He can also tell you where to get reamer.Ed.

[hubel458]

Here is picture of another fellas work on AR forum,
of NEF 12GA FH, factory thumbhole stock
and a brake he built, with wide slots in top and round
ports on the sides. He is testing heavy slugs.Ed

[hubel458]

Here's picture of solid turned 12ga slugs that Rob makes.
They are flat on one end and hollowpoint on other.
They can be shot either direction. Aluminum ones
are 346gr, brass 1080gr........If you need any
contact him. He, RIP, and others on AR are testing
them with different powders. I have gotten similiar brass
ones to 1900 in NEF with RMC case, with
140 gr the new RL-17. Ed

[hubel458]

Heavy brass slug testing-----
RIP'S components in first picture-
15gr Blue Dot starter, thin plastic separator,
230gr HBMG, thin plastic under slug,
and 1087gr brass slug; in a RMC 3.5"
brass case, fired in his great looking,
braked NEF 12ga FH Ultra, got him
1812 fps average. Barrel and brake
are 27" total length. Great work. Ed

[hubel458]

One of our testers, Bret in MN, got the BPI Sabot with
500gr Hornady .500 slug up to the good speed listed
on BPI"s loading sheet, using shotgun powders. I could
get them there with my loads using much larger amounts
of rifle powders. He tested 3.5" Federal plastic cases in
his Savage 210 with 3.5" chamber and the 28" heavy barrel
he put on. With 50gr of Longshot(max load for all modern
guns) he got 2550 fps, with 500gr in sabot. He use two
BPGS gas seals fitted together over the powder, then
a FS12 Flexseal wad, then a 1/4" cork wad, then the sabot.

Then a good strong roll crimp with drill/drillpress crimper.
This load is at mag shotgun pressures by case expansion
measurements and BPI's 46gr load tested at 12,500 psi.
He also did one with one BPGS and two Flexseals and had
200 fps less.He had tried other combinations seals/wads
and with same amount of powder and got lower yet.
He also went up with the powder, with seal/wads that worked
the best and got about 3000 fps, but the plastic cases
stuck and wouldn't eject easy. I will be testing same
seal and wad column in a few days, in my NEF with long
barrel to compare results.I thank Bret, he is a real
good experimenter and idea man. Everybody is trying
like crazy to get that 500gr saboted slug up to big
game gun velocities with shotgun powder and thanks to
BPI"s supply of the right components it has happened.Ed

[hubel458]

Rob on AR is building a 12GA FH double on a Zabala Double
10 gauge frame. It has the Greener crossbolt. He cut off
barrels to make a 4" long monoblock double to screw a
pair of heavy 12ga rifled Pacnor barrels into. He reamed out
monoblock section and threaded it. His barrels are
1.116" at the breach, .97" at muzzle and 22" total length.
Barrels threaded into monoblock with a 15/16" x 32 thread.
In the pics it is partly done and he will put in the ribs
and integral sight rib and regulate for accuracy.
It will be about 14.5 lbs when done he says.Ed

[hubel458]

Some more BPI seal and sabot testing.
First of all both Bret and I have heavy tight fit barrels
and his barrel on the Savage is faster twist so it took
him 50 gr of Longshot to get what BPI got with
looser barrels and slow twist at 46 gr of Longshot.
For non heavy barreled guns only go to 46 gr.
I did a bunch of tests in my NEF long barrel with long
chamber. My store didn't have any 500gr .500" XTP slugs
so I used some 420gr .512" dia lead Great plains in the
BPI sabot. Using 2 BPGS powder seals, a BPI Flexseal, a
cork wad in 3.5" new Federal cases, roll crimped, I got
2800 fps with 420gr slug. I tried 4 other powder seals,
2 cards, a Remington, a Win, and a odd one, all with the
Flexseal and lost velocity. I fixed up my crimper so it would
roll the plastic down and over inside edge of sabot, as before
it would turn plastiC in too sharp and get some of the crimp
outside the sabot top. If sabot was too low so that the plastic
crimp went clear down to the slug I got high pressure signs.
I also did same loads in used 3.5" REM cases ok.
Now, I thought I should have more velocity, so I swaged the
.512" 420GR slug down to .500" like they say the sabot is for,
AND I GOT OVER A 120 FPS MORE. Everytime. I also used
Alliant Steel powder and got all the same results, using
60gr. It is easier on cases. I also substituted the doubled up
BPGS powder seals and the Flexseal with 520gr Lyman in
place of the seal and cushion on the WW12 wadcup the Lyman
fits in, with some RL-17 loads, of 150gr, and got over 200fps more
that the original WW12 wadcup gave with the Lyman.

Velocity secret is to have the perfect sealing setup with
slug/sabot combo that is NOT too tight. Only tight enough
to get accuracy. The cork seems to protect the sabot
base ok on the shotgun powder loads, and not needed
on the RL-17 loads, which is a easier accelerating powder
and without cork helps make room for the RE-17. I think I
will get increases in the brass RMC cases, with RE-17, with
the BPGS doubled and a Flexseal in place of cards and wads.
We will know soon.Ed

[hubel458]

Here is picture of the breach of 8ga FH NEF with
case in it, to show that the gun is strong enough
for 8ga. I was a 10ga NEF. Has 29" effective barrel
length, and the internal expansion step at muzzle
for the ports that stops muzzle climb and reduces
recoil. Which along with thick pad and thumbhole
stock makes for easy shooting.Ed