Comparison of slug type and speed for accuracy.
Comparing better 12ga slugs for rifled and smooth.

The US-S 570gr slug, with
locked on base does 2-3" groups at 50 yds
and about 9" at 100yds in heavy barrel.
At 2000 fps in smooth bore.

Now a Dixie 600gr slug in rifled barrel at 1300,
2-3" at 50yds- about 9" at 100yds;
BUT Dixie at 2000 2-3" at 50 yds and 6" at 100 yds.
It seems that slower slugs in rifled barrels losing velocity
gets below the speed of sound at 100 yds which
affects accuracy. Of course super heavy bullets, like
12-1500gr, make it harder to start out fast
enough to be supsonic at longer ranges.


This accounts for the guys info I posted earlier about his
high speed in rifled 20ga killing deer at 160 yds.
And holding tighter groups at longer ranges.
He kept velocity above the speed of sound
further down range......Ed

Got asked about slugs going from supersonic to subsonic.I understand
it is that blunt bullets that are in most shotgun slug/sabot loads,
do not maintain best accuracy when passing back under the speed
of sound like spire point bullets do.Speed of sound about 1150 fps.

Now on, FED 239 primer in 8bore and the 4bore cases I have
with shotgun primers. They almost as strong, from my primer tests
as the kiln primers from WIN and REM.And they seem to dent easier
in my 8ga testing than FED209 or the REM kiln ones. I get them from
the 3.5" 10 and 12ga Fed primed magnum cases. Makes ignition surer.

Lotta guys want to try Magtech 2.5" 12ga cases. Well they are
stronger built than any of the old time brass cases I have seen.
About dollar each, go in same chamber as plastic, same strength.
The rifle looking cartridge in a slug gun is what some like..
If you have break action load them with protruding slugs any length.
If auto or pump in 3.5" chamber load them up to 3.1" overall
with protruding slug and you can feed from magazine.
RCBS has sizing dies. Loaded that length about the same power
as a 3.5" plastic case roll crimped on same slug, magnum load.
Don't leave air space in Magtech, but use wads and seals
like in plastic cases..Ed

I found some 4bore plastic cases, 4 inches long, red
colored, looking like an oversize 12ga Activ case, They are all
plastic without a steel insert in the base like Activ cases
have. No markings. I understand they are Fiocchi.
They are the size for the 4bores that are about
.950 inch bore. They are suitable for shot loads of moderate
pressures. Guys loading them say they stretch out after
a few loads. And they use about 3 oz shot.
I will test them with a light buckshot loads
of nine 45cal buckshot, 140 grains each.
Total 1260gr, a little less than three ounces.
In picture are plastic cases with brass ones and 3.3" 8ga.
The base of case will be shimmed with strong wide tape to
fit our chamber, cutting down on the stretching.Ed

When I made the 16ga FH, shown earlier in this thread,
I had couple bmg cases that were partly worked down, and not
yet expanded to 16ga mouth size. With a rim on it bigger than the
base which was .770". Well, I've had guys ask if I would ever
have bottlenecked cartridge. This led me to a way to do one.
I made rim .770, left shoulder diameter, swage case sides straight,
and expanded neck for 585" size. Cut the case to 3.7" length, and
we have the 585 Hubel Super Magnum. This will be my only
bottle necked wildcat. I can make the mag box on the MRC PH
long to feed case..Good over 16,000 ft lbs,Regular 12-14,000 ft lbs.
Will that put trex in small letters.....Pictured with 505 Gibbs to which
it has nearly identical larger shape and good side taper for easy
extraction, with heavy loads.And I can make cases like I do with
my 700HE.Cases hold 250gr ball powder under bullet. WooHoo.ED

Shot 4 ga plastic case with 7- 140 gr balls, 980gr total
1800 fps. Used duplex load- Blue Dot 100gr, - Re17 150gr.
A card and couple nitro wads under load and card over, glue gunned
the card in. Shot loadedin two rows of 3 and 7th on bottom
in recess in the middle of top wad. Red plastic case ok some
expansion. Just about the limit for an all plastic case.

Here is picture 0f 585HSM and some other cases.
Gonna test a few in trusty ole Enfield I shot
the 700H 3.25 in with extra rear lugs. Change barrel
lengthen port.It won't do maximum real hotrod
loads like when I put it in PH later, but it'll
outrun trex.2nd pic... ED

In the 4ga plastic case a 760 gr ball at 2000 fps
extracted ok. 3oz #2 shot load at 1500 ok.
More 8ga stuff, fired a 2 ball, 820gr load at 1600
with all the RE17 it had room for. We fired 1300
gr cast full bore 8ga hard slug at 1700. Found a
guy who can do them. Here is picture of his 10
and 8ga cast fullbore hard slugs. 2nd picture is the
585 HSM case sectioned with a competition case
showing how strong brass is.Ed

The 4ga all plastic case good for 4 of my magnum
pressure loads, with our slower powders,before
it is expanded to much.
Compared to the brass cases, at 50% more pressure,
I've fired one 6 times and sized, and fired it 4 more.ED

Damn these are insame!!!!!!!! I wanna shoot it next!!!!!!! And I thought my .577 experience was something. Nothing to what this thing could be like!!!

We found some 585 hardcast, sized and lubed bullets.
Works ok in my 585s at high speed. Shown in picture.

We showed 10ga slugs above, Another easy to do
10ga slug load is the 10ga wadcups for lead BPI has,
with a 69cal swaged lead bullet in it that Dixie sells.
It is hollowbased and 750gr.Also use the same wadcup
for buckshot. Some are showing interest in 10ga
due to NEF making them with heavy bull barrels.
Another experimenter has got a bunch
of RMC 3.5" brass 10ga cases, and will load and test
the fullbore 10ga slugs shown above. RMC can do
them about any time you want.Ed

Ok, this stuff is WAY over my head, but...