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12ga,10ga,8ga,4ga FH;585HE/700HE, other Big Bores--

 
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  #92  
Old 02-22-2014, 05:53 AM
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Join Date: Sep 2006
Posts: 98
Re: 12ga,10ga,8ga,4ga FH;585HE/700HE, other Big Bores--

Some guys in 12ga like to use the Magtech brass cases
but the cases being brass the sides are thinner than
plastic, and that makes loose fit in 12ga chambers.
And case expand a lot and are harder to resize,
But I found that .750 hollowbase 10ga slug fits
those cases and still chambers ok. Not a sloppy fit.

So If you have a 12ga smooth barrel with full length
backbore job, of .850" bore or bigger you could use
the Magtech brass and ,850" size 10ga hollowbase slugs.
Now these .850" slugs won't go in a 12ga plastic case
and chamber in regular 12ga chamber.

Brett in MN used the a BPI AQ slugs in his full length
backbored 12ga and got fair accuracy as he said the wads
under slugs expanded a lot for a decent fit.
The 10ga slug shown in the 2.2 inch Magteck is 900 gr,
and .850" diameter. These cases will take magnum
pressure so you can get good speed, for what this short
case can hold.

It is too bad they don't make 3" and 3.5" versions.
These 2.5" cases are easier to find and much less than
others, so if needing brass ones you can rig up guns
to work with them. To build a new barreled gun in actual
12ga size, IE .729" bore, you'd make chamber to
minimum specs so cases don't over expand.
In the picture are 2 10ga slugs on right, like in the case,
and 2 12ga jacketed slugs and one 12ga lead slug left.ED






Here is the ytube URL again for our guy
shooting 585HE in his NEF----By mid summer we plan on a
pickup truck load of more 585HE cases coming in.

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  #93  
Old 02-22-2014, 08:10 PM
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Join Date: Sep 2006
Posts: 98
Re: 12ga,10ga,8ga,4ga FH;585HE/700HE, other Big Bores--

Correction on previous post-The pictured Magtech case is 2.5" long
and the 10ga slug is 800 gr.Ed
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  #94  
Old 03-12-2014, 11:32 PM
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Join Date: Sep 2006
Posts: 98
Re: 12ga,10ga,8ga,4ga FH;585HE/700HE, other Big Bores--

Here is good simple system with big hollowbase slugs to stop
the skirts from deforming, I found that dense dow foam works
good, I was using glue gun but dow foam is easier, Just cut
plugs out of foam sheet and force into the base. Make a tight
fit, use spot of glue inside, glue that is for foam....
Trim off the foam flush..In picture is 10 ga 900gr slug.



How we get good 24ga plastic seals with protusion on
top that fits up inside 58cal Minie base, same bore as 24ga
and our 585HE. I get the 24ga seal by cutting apart the BPI
24ga Brush wad, getting two seals out of each.Works great
in plastic case giving a shorter column than other seals and
wads, so we can get in enough of our 4759 for good speed.
The 24ga idea is getting nicer all the time with
the variety of cheap 58cal slugs, and good 3" brass cases,
drawn cases, we didn't have to wait to get made.
And all kind of guns we can use, bolt 395 Mossbergs, single
shots of all kinds, Autos,, pumps. bolt action Savage,
even 1887 Win and Greener MKIII, bolt action JC Higgins. .



Here is picture Khan auto we setting up 24ga FH, it is 3.5"
model, has a 12ga barrel to change with. Being 3.5" it
feeds/ejects through lengthened port 3" brass 24ga cases we
made from 577NE brass. We rework back of the bolt for
slightly longer stroke.Ed

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  #95  
Old 04-23-2014, 04:24 PM
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Join Date: Sep 2006
Posts: 98
Re: 12ga,10ga,8ga,4ga FH;585HE/700HE, other Big Bores--

http://www.gunownerstv.com/tankhunter.jpg
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  #96  
Old 04-23-2014, 04:24 PM
Bronze Member
 
Join Date: Sep 2006
Posts: 98
Re: 12ga,10ga,8ga,4ga FH;585HE/700HE, other Big Bores--

Here is picture of 24ga cases, loads; and some slugs and seals.
Brass cases are 3", plastic cases are 2.5". Brass 3" can be loaded
to match 577NE power.



Here is of 24ga in an 87 Win, just test gun of mine. Uses same barrels
as our 585HE, This one has slow twist for Minie bullets.Our guys
have got supply of regular and slow twist barrels.



Here is picture of the first 585HE done and shooting in Australia.
It is owned by the poster, 'tankhunter' on the AR forums.
Built by his smith who has a reamer.
Guys there can get cases from Bertram, and there will soon be three
reamers there. There is a company there now making 585 barrels,
Allan and Grant Swan. in Redbank, Queensland.....Ed

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  #97  
Old 08-15-2014, 05:44 AM
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Join Date: Sep 2006
Posts: 98
Re: 12ga,10ga,8ga,4ga FH;585HE/700HE, other Big Bores--

Finally got back to forums.Been busy with 24ga FH and 585HE
and getting 585 cases made, as many as possible...

We are now working a bit with 24ga FH and here is picture
of it with our 585HE case. Both use same bullets/slugs, same
bore barrels. Main use difference, 24ga FH easy setup in break
actions and 585HE in bolt actions and falling blocks.



Picture of non-discarding 585/24ga sabot cup I found that holds
458 bullets and slugs tight. It had hammerhead type slug in it that
was pulled out and they wouldn't stay in tight. Sabot was a loose fit
in 20ga, made for 20ga, but small, so I shrunk the bottom rib,
fits perfect, super tight, in 24ga and 585HE. Fits real tight to give
good resistance for good ignition.



Here is another 24ga/585 sabot that holds .452" 45cal pistol
bullets. Made by Hornady for 58cal ML. With 250 gr bullet in 585
will go about mach 4.



Here is easy way to weight plastic stocks with hollow butts, use rubber
coated computer mouse balls, weight comes out perfect without being
too heavy if using that much lead.And coating keeps them quiet, and
we hold them in with piece dense foam under butt pad....Ed

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