12GA rifle From Hell--

[hubel458]

Here is picture of an early falling block for big bores
called the Field I think. Looks like some other
side levers, looks like lever works forward.

And speaking of falling blocks next picture is the
start or 'fixins' so to speak for the next step
up, for my 2bore. Same design as the 4 and 8
bores only wider.

I am now getting 2.25" OD barrel reamed
out to the two bore size.
And a square hole for breach block done
in that hunk of 4130 steel.

Other experimenting, a while back, when I made
my 585 Short HE from Gibbs cases, I also made a
620 Short HE from Nyati case, of the same design,
IE, head spacing on the mouth and extractor.
Using 600NE .620" diameter bullet and 2.7" long case.
Case could be shorter or longer like the 585 one.
Didn't do much with it as its sides were very straight
only .010" taper of both sides together. Whereas the
585 Short HE had .027" total taper both sides. And any
Nyati brass I got, went to make my 585HE cases..Ed

[hubel458]

First is picture sectioned Explora case and slug, showing how
they kept weight down so that it could be stepped up in
speed in older doubles, with just short rifling section at muzzle,
that didn't have real heavy barrels. Second picture from Greener
book here, is of older 4 and 8 gauges.

Third picture shows steps of making 4bore case, one inch bore,
from 20mm. 2nd in picture is case with base turned and swaged
to size which leaves base smaller than rim, for rimmed case.
Then 3rd case has top expanded to take 1" diameter slug.
last shows the thickness and strength of finished case.

Testing factory 20ga Hastings sabot slug 3.5" hotrod loads, and
reloaded with 20ga SPW identical slugs, 390gr, goes about 2200
from 30" heavy barrel. Load was 75gr of 4759.
Factory is about 1900. For regular modern barrels you could
do with 65 gr and get about 2000.Ed