Somebody say bottle neck?
since I have a .400 Corbon barrel
for my 1911 I'll chime on in on this
subject.
.400 Corbon - developed by Peter Pi at
CorBon - .45 ACP necked down to .40 with a
25 degree shoulder. Corbon has not submitted
it to SAAMI for a pressure spec. but some
suspect it is in the 26,500 range. I have
two boxes of .400 CorBon
155 gr. Speer GDHP @ 1,400 FPS &
155 gr. Hornady XTP JHP @ 1,360 FPS
I exchanged some emails exploring the
possibility of a revolver in .400 CorBon
with Hamilton Bowen. The S&W Da is
not possible with a modified S&W Cylinder
as there is no cylinder to start from & he
also pointed out the possibility of case back
out. He suggested a Ruger SA - use a barrel
in .38-40 and mod. the cylinder - if it had
chronic case back out it could still be changed
back to .38-40 and salvage the gun. At that point
I thought why even do it, just get a SA Ruger in
.38-40.
Speaking of the .38-40, it is a necked down .44-40
The .38-40 is mis-named in that the bore is .40 -
it should have been named the .40-40
The .32-20 is it's own 'parent' circa 1874.
The .25-20 and .219 Zipper? or .218 Bee?
necked it down further.
The .22 Jet is a necked down .357 Magnum
but it, more so in profile is like the .38-40 as
the case is in a long taper, not an abrupt
shoulder.
The older bottlenecked cartridges are SAAMI'd
at 14,000 psi?c.u.p pressure - the Jet at
.357 Mag = 35,000 pressure would certainly lead
to more expansion of the brass case.
I think case back out is a combination of
pressure, case shape, and the chamber
dimensions - & stretched brass reloades
even if resized the abrupt shoulder on some
of the different types stretch and would get
right up agin the bottleneck shoulder
and chamber length. I hope that makes sense
Bottle necks work well in rifles and Semi-Autos, long
guns or handguns because of the
strength of the actions or the nature of
Semi-autos in relation to revolvers.
Hmmm, a Auto Ordanance 1927A1
rebarreled to .400 CorBon. It would
certainly be loud.
OH, FWIW
The necked down .45 ACP to .357 has been done
at least a couple of decades ago.
I think I recall a necked down cartridge
in a Guns & Ammo article in the late 70s or
early 80s - a Commander with either a .45
ACp or a .38 Super necked down to .22 and it
broke 2,000+ FPS.