|
The
Conventional Wisdom
|
|
John
Alexander |
Cast bullet shooters who have tried it
are often not too positive about shooting 22 cast bullets. A lot of people
have apparently been frustrated trying to shoot this bore size accurately.
The chorus of complaints which have become the conventional wisdom about
22 cast bullets include:
-
1. Hard to cast
-
2. Must be carefully sorted and weighed
since small defects or weight variations ruin accuracy
-
3. Fragile
-
4. Susceptible to being blown off
course by wind
-
5. Generally inaccurate
-
6. Too small to handle conveniently
I have been shooting 22 cast bullets in
CBA competition, with fair success, off and on for over 25 years and have
found only one of these disadvantages to be absolutely true. Tiny bullets
really are harder to handle than larger bullets.
Are they harder
to cast?
I have never found 22 cast bullets
harder to cast than larger ones. In some ways they are easier since the
smaller amount of molten metal involved causes less trouble with molds
getting too hot and slowing casting.
Do small
defects ruin your day?
The contention that small bullets must
be carefully inspected and sorted by weight for decent accuracy is
probably just opinion based on “logic” or theory. I have never seen it
supported by experimentation. It seems to be based on the reasoning that
defects will cause more trouble in smaller bullets since the defect is a
larger percentage of the bullet. This is a classic case of starting off
with a questionable assumption and from that drawing a logical but
erroneous conclusion. Similar to claiming that the earth is obviously
flat.
The faulty assumption here is that
smaller and larger bullets will both have the same sized defects. Maybe
defects are proportional to the bullet size. A pretty good argument can
even be made that smaller bullets may have proportionally smaller defects.
One of the most treacherous defects in cast bullets is the dreaded
internal shrinkage void. I have read about this problem with larger
bullets but have never heard of or experienced it with the 22s. The
smaller volume of the 22 may allow it to better pull in sprue metal needed
for a solid bullet as it hardens. Internal voids may happen under certain
conditions but I’ve spent a lot of time searching for them by weighing and
have never been able to find an internal void in a 22 cast bullet.
Maybe we should check the theory by
experimenting
Anyway the proof is in the pudding. I
have shot hundreds of well wrinkled or rounded based 22 bullets (gas
checked) in direct comparison with visually “perfect” bullets without
detecting an accuracy difference down to the minute of angle (MOA) level
of accuracy. The same lack of difference in accuracy has also been
observed in side by side comparisons of carefully weight sorted bullets
fired against mixes of the light and heavy culls. I don’t have similar
data for larger bullets but careful sorting of 22 cast bullets by weight
or for minor visual defects seems to be a waste of time.
Are they
“fragile”?
It is claimed that 22 cast bullets
require extremely careful handling because they are “fragile”. I’m not
sure exactly what that means. Certainly a bullet, of a given alloy will
have about the same hardness (resistance to plastic deformation), whether
large or small. Dropped on a concrete floor, it will have a dent somewhat
proportional to its weight, bigger bullets - big dents, smaller bullets -
small dents. Some don’t degrade accuracy but probably none improve it.
Does the wind
blow them away?
No matter how silly some of the
conventional wisdom about 22 cast bullets, it must be admitted that the
contention that 22 cast bullets are wind sensitive and difficult to shoot
accurately is somewhat true for most of the 22 cast bullet designs
presently available.
At the root of this problem is the 1 in
14 inch twist used in the vast majority of 22 centerfire rifles. This slow
twist will only stabilize short bullets (up to about 0.6 inches) and
naturally enough, mold makers provide molds for bullets this twist will
stabilize.
The usual 22 cast bullet, such as
Lyman’s good 225415 and 225462 designs, weigh less than 55 grains This
makes their sectional densities (SDs) a very low 0.16. A thirty caliber
bullet with a similar SD would weigh less than 105 grains.
Since the ballistic coefficients of
similar shaped bullets are roughly proportional to their SDs, the typical
blunt 22 bullets have very low BC's, seldom above 0.12. The lower the BC
the more wind will deflect it on the way to the target.
So 22 cast bullets are wind sensitive
because they have very low ballistic coefficients (BC) as a result of
their low sectional density and blunt form. The low SD and blunt form are
needed to work in the usual 1 in 14 inch twist. If thirty caliber shooters
used blunt 105 grain bullets they would have the same difficulty as
twenty-two shooters with wind deflection.
Length and
Accuracy.
It is also easier to get a cast bullet
started straight into the bore and thus improve accuracy if it has a
longer bearing surface. If thirty caliber shooters used 105 grain bullets
they would have the same difficulty getting match grade accuracy from
those short bullets that 22 shooters have with short bullets.
Thirty caliber shooters have learned
not to try to compete with bullets of 105 grains with their resulting low
ballistic coefficients. The lightest thirty-caliber bullet you are likely
to see in CBA competition is 170 grains and the average is closer to 200
grains. I believe the use of very short cast bullets, required by the slow
twist commonly available, explains the twenty-two’s reputation for poor
accuracy and for being sensitive to wind.
Shooting
Conventional 22 Cast Bullets
Although the short 22 cast bullets are
not likely to win many matches against knowledgeable thirty caliber
shooters, it is possible to get good accuracy for squirrel hunting,
plinking and target practice from them In spite of the handicaps described
above. The advantages over larger calibers include low noise, low recoil
and excellent practical levels of accuracy. Additionally one pot of metal
makes more bullets than you want to cast in one session.
The important principles are the same
as for larger calibers. Make sure the bullet is large enough, at least
over .225 inch for most rifles. Seat the bullet far enough out to fit into
the throat. Don’t try for velocities similar to those expected with
jacketed bullets until you figure out how to make the 1,300 to 1,800 fps
loads shoot well. Start with some of the suggested loads for modest
velocities in the Lyman Cast Bullet Handbook. I have had good luck with
six to nine grains or either 2400 or 4759 behind either a 225415 or 225462
bullet in the 222. Wheel weight alloy may give better accuracy than some
of the harder alloys like linotype.
With a good rifle you should be able to
easily find loads that will average better than two minute of angle
accuracy (MOA) for five shot groups. With enough patience, a good rifle
and a little luck, you may be able to average 1.5 MOA or even better.
Other
possibilities
The loads above won’t be too
competitive in a CBA match or too impressive while sniping at prairie dogs
at 200 yards in a wind. The solution for this is a faster twist and longer
bullets. Fortunately, the military’s need for long bullets for the M-16
has led to a twist of 1 in 7 inches in our present service rifles. This
enlightenment is beginning to slowly carry over into commercial 223
Remington caliber rifles. Most now offer 1 in 12 inch twists which is a
little better. Savage, and more recently Winchester, offers their 223
rifles with a 1 in 9 inch twist. This not only allows jacketed bullet
shooters to use the longer and heavier target bullets now available but
opens the possibility of finally being able to have better 22 cast
bullets, at least for the 223.
A 1 in 9 inch twist will stabilize a 22
bullet of up to about 0.9 inches long. This can translate into a pointed
bullet of over 80 grains and a ballistic coefficient over twice that of
the blunt, short cast bullet designs.
The major mold manufacturers don’t yet
offer designs to take advantage of the faster twist barrels. NEI is an
exception; they offer the 224-72-GC-DD. Of course for more money you can
have a custom mold for any design you can think up. I have had good luck
with molds from David Mos.
More and more people are realizing that
the usual Savage in 223 with a 1 in 9 twist will usually outshoot other
223 rifles of similar weight. Maybe when this sinks in, the manufactures
will understand that although a 1 in 9 twist may not be better for the
short jacketed bullets most people shoot, it doesn’t seem to do much harm
and allows a greater selection of bullets. It is a shame that 22 Hornets,
Bees and Fireballs aren’t available in 1 in 9 twists. One of them might be
the ideal 22 cast bullet rifle.
Longer bullets
really do change things
To illustrate the potential for longer
22 cast bullets. Andrew Lambley, of Nottingham, UK reports good luck with
a 223 Savage FLVSS and the NEI .224-71-GC bullet, of heat-treated wheel
weight alloy, ahead of 16 grains of VV N-120. He also has good luck with
Blue Dot, VV N110, 2400, and RL7.
The 16 grains of VV N -120 load
produces 2,450 fps, shoots five shot groups of about 0.7 MOA, and doesn’t
need cleaning for about 1000 rounds. He also reports good accuracy at
velocities up to 2600 fps but accuracy only lasts about 100 rounds before
cleaning is needed. He is a Bisley match type shooter and shoots the above
load for all his match shooting at 50 meters, 100 and 200 yards. He
reports that the load is not effective beyond 200 yards.
He claims these bullets are no more
difficult to cast and handle than any other and quality control is limited
to visual inspection. Gas checks are seated with the Lee system and Lyman
Super Moly applied through a convention lubrisizer. Then just to confound
the fussy types he loads on a Lee 1000 progressive press.
At the other end of the scale, to
duplicate 22 long rifle ballistics Andrew uses two grains of bullseye “for
940 fps and accuracy to rival the best 22 match ammo”.
Personal
experience
My own experience shooting 22 cast
bullets in competition also should encourage potential converts to give it
a try. Although I have never won any CBA National Tournaments nor even set
any national records, I have been respectably competitive while using the
22 in competition on and off for many years of less than single minded
effort.
I started competing in Cast Bullet
Association postal matches in late 1970s shortly after CBA was organized
with a lightweight Sako 222, my cast bullet squirrel rifle at the time.
Best results were with the Lyman 225415 bullet, but the 225462 did about
as well. With 6 or 7 grains of 2400 and beeswax lube. I could hold my own
against the thirty caliber shooters in the postal matches but they
couldn’t shoot very well either in those days. Best I could do was an
honest average for five shot groups of 1.5 moa. That was often good enough
to at least place in the 1970 postal matches.
Doing well in postal matches, which I
usually shot early or late in the day when the wind was insignificant,
turned out to be far different from real matches. The first time I entered
a CBA National Tournaments I quickly learned that shooting when the wind
was blowing put the 415 bullet at a serious disadvantage compared to the
long thirty caliber bullets used by about everybody else.
When Ruger started making Number Ones
in 223 with an advertised 1 in 10 inch twist I bought a Ruger Number 1B
and designed a longer bullet which the Greenhill formula said should
stabilize. I sent my design off to Walt Melander of NEI along with the fee
for a custom cherry in the spring of 1981. The resulting mold was very
well made and casts bullets of from 70 to 73 grains, depending on alloy,
with no problems. Walt listed it in the NEI catalog as 71.224 GC and later
as .224 -71-GC.
The Ruger turned out to have a 1 in
10.7 inch twist that would just barely stabilize the 71 grain bullet. In
spite of a lot of oblong bullet holes the combination shot well. With 9
grains of 5744, CCI magnum primers and LBT Blue lube I could get honest
averages of slightly under 1 MOA for five shot groups if the wind wasn’t
blowing too hard. This was good enough to be competitive in CBA Production
Class throughout the 1980s. I won my share of postal matches and shot the
highest Production Rifle scores in all three 100-yard aggregates in the
1989 CBA Nationals. 200 yards was a different story.
The round nose NEI bullet at 1600 fps
was blown further off course than the usual long 30 caliber bullets at
higher velocities in the same conditions. I was invariably wiped out at
200 yards where coping with the wind is four times harder than at 100
yards This was not all the bullet’s fault since my wind doping skill
wasn’t and isn’t what it should be.
More recently, Savage started making
223s with 1 in 9 inch twists that should stabilize bullets up to about 0.9
inch long. I designed an 80 grain, pointed, bore riding bullet to take
advantage of the faster twist. David Mos made a mold that casts
beautifully. The bullet is 0.92 inches long with gas check and will
stabilize in the 1 in 9 twist. For the first time I feel as if I’m on an
almost equal footing with the 30 caliber shooters at 200 yards as far as
ballistic coefficient is concerned, if not skill level. I have placed
above average in production class in the last two CBA National
Tournaments, even at 200 yards, but haven’t won an aggregate yet so I
still have plenty to learn.
Summary
Contrary to much that has been said and
written about casting and shooting 22 cast bullets, there are no
insurmountable problems. However, the common slow twists used for most 22
centerfire rifles do limit the length of bullet to about 0.6 inches and
this in turn limits resistance to wind drift and levels of accuracy.
In spite of this limitation, it isn’t
hard to get good practical levels of accuracy for anything except serious
benchrest competition with several of the currently available molds for 45
to 55 grain bullets. The advantages of shooting 22 cast bullets include
low noise, non-existent recoil and low costs for metal and powder.
The 1 in 9 inch twists of current
Savage or Winchester rifles chambered for the 223 now make the use of
longer bullets feasible. With bullets such as NEI 224-72-GC-DD or even
longer and heavier custom bullets it is much easier to attain the accuracy
and resistance to wind deflection needed for benchrest competition or
other precision shooting.
Shooting 22 cast bullets is a
relatively neglected practice but one that is a lot of fun and easy on the
ears, shoulder and pocketbook.