What do you do with the group sizes, average velocities, and standard
deviations reported
by
another shooter? His results can influence which
loads you select for trial. Choosing a load that
's
listed
in
a manual and also
worked for
him beats choosing a random load. After you've tested the other
shooter's load, his results should not sway your decisio
n.
What counts
is
how the load performs in your gun, when compared to other loads
in
your
gun.
Some shooters question the use
of
standard deviation in load development.
We agree that velocity unifonnity
or
standard deviation should not be the
only criteria used
in
selecting a load. Standard deviation must be considered
along with everything else you know about the load. Note that the measured
standard deviation includes variations in both the ammo and the chronograph.
Chronograph systems with inadequate spacings between skyscreens often
give passable readings
of
average velocity, but questionable readings
of
standard deviation. Whenever you use standard deviation, remember there is
an
important corollary
of
Murphy's law.
Tts
regular use can replace many
mathematical theorems and complicated statistical procedures.
Page 24
Large groups usually repeat;
Large groups with large standard deviations always repeat;
Small groups caused by luck never repeat.
CARRYING
CASE
The carrying case
is
Obviously a double rifle case. We have used similar
cases over the years and have found them very convenient. When you take it
to
the range, you have the entire system. You might even have spare paper
and battery tucked away. We experimented with individual pockets for each
item, but found that the single padded pocket for the Model
35P along with
the large area in which to toss all incidental items was the most convenient.
Jf you are using the large paper roll, you must remove it to fit the Model 35P
into the case. We usually remove the paper roll from the hanger but
kave
the
paper threaded through the unit. Sometimes rethreading the paper can
be
difficult, but it
is
easy enough to restore a wrap or two on the paper roll.
One trick that many users have found convenient
is
to leave the skyscreens
on the rail. Remove the diffusers, then loosen start and middle screens and
slide them against the stop skyscreen. Loosely coil the cables and place the
rail with screens in the case.
It
will make assembly
of
the screens and rail
much easier next time you use
il.
Add the folded stands and the diffuser pieces. The foam
in
the top
of
the
case will keep everything together when the case
is
closed.
Page 25
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