GUNS Magazine September 1956

and make up a test single shot rifle, with an
eye to accuracy. One of Winfield's Remington
rolling block rifles was torn down and the
7mm barrel sleeved to handle a cut-off piece
of 4-groove Springfield rifle barrel. Overall
length of the finished barrel was a shade over
18". The .220 Swift brass is close to the Russian
cartridge in base dimensions, except the
Swift has a semi-rim that works better in the
single shot Remington.
GUNS experimental laboratory machinist,
Kingsley Karnopp, turned a mock-up of the
case from aluminum and we poured a hard
lead-zinc alloy die to swedge back the Swift
shoulder, necking the brass to .30. Some Ball
M2 150-grain and armor piercing bullets
were salvaged from .30-06 ammo for pressure
and penetration tests. As this shortie should
do well as a hunting load, 100 Sierra spitzer
bullets and 100 Hornady roundnosed softpoints
were used, both types weighing 150
grains. These were precision hunting bullets.
Powders used were #2400, and #4198,
adapted to small-capacity cases.
The Swiss round was loaded with a steeljacketed
154 grain bullet with a bulky ogive
and lead core. Charge was 22.5 grains of a
flake powder. By contrast, the reformed Swift
case, filled to maximum leaving room for the
bullet, held over 23 grains of #4'198. A low
charge was used to fire form the first trimmed
case, and then 20 grains of #4198 poured in.
By this time the evening had dragged on
until it was past 11 pm. But we had to fire
the first shot after all this preparation. The
racket echoed over the hills and waked, the
, neighbors' cats and dogs, but pressure as evidenced
by the Federal 120 primer was still
low. There was not a sign of flattening and
the 20-grain charge while a good load was
far from maximum. The next day with all
the cases formed and a Lyman .tang sight
mounted to give a sight radius of some 22
inches, we tested the little Russian at 100
yards for accuracy.
Best load of all grouping within 2%"
inches in the 18" barrel was the Sierra bullet
and 22 grains of #41W. This was close
to the maximum charge with this powder
which gave a slightly flat primer with no sign
of dangerous pressures. Extraction was very
easy. The new Remington action kept the
cases from stretching and each case was reloaded
from three to five times. Load with
#2400 powder was 16 grains. Both these
loads gave average accuracy under 3%''
inches at 100 yards from rest.
The Ball M2 bullets loaded with 22 grains
of #4198 gave several 3-shot groups averaging
21h1'. But the most interesting test was
with some % "bullet proof" steel plate. The
exact nature of the steel was not determined,
. -
but it stouued two 9mm uistol bullets of 123
grains at 1300 feet per second fired point
blank, which deeply dented it but did not
penetrate nor crack the steel.
An AP shot from an 18" barreled -30-06
drilled clean through. But apparently we
didn't have a thick enough plate, since the
Ball M2 bullet also drilled through, leaving
a star petal of brass jacket around the hole.
The hole measured %'I diameter, an indica-
tion of energy when compared with another
shot. ' The sideways plastic distortbn of the
steel created by one bullet would indicate
similar energies if the same plastic distortion
was created by another bullet. The Ball M2
bullet in the short Russian with 20 grains of
#dl98 drilled a virtually identical hole
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