Useful Links . . .
Cutting-up wallpaper takes time. However,
for those who pattern using a frame where the shot can pass clean through
the target material, these links
to US suppliers may be even better: 'Shotgun Patterning Material',
or possibly better still is 48" wide paper from Dick
Blick Art Materials. It is low-cost and available mail order - just make
sure you are far enough away so the paper does not tear!
The Mysteries of Shotgun Patterns by Oberfell & Thompson is
available from www.rayrilingarmsbooks.com.
Eley Shooter's Diary. Eley Hawk Limited. www.eleyhawkltd.com.
New Views on Chokes and Patterns. http://www.basc.org.uk/media/choke_article1.pdf.
(For some reason it is not always available for download, but you
should persevere, it is worth it.) It is an interesting paper that
again calls into question long-held beliefs. In summary, it finds that
there is not much (if any statistically significant) difference
between the average spread of a half-choke and that of a full or
extra-full choke. This is contrary to many past references, including
the Eley Diary cited above. The paper also shows the variation within
a set of nominally identical shells and suggests that several shells
should always be analysed, suggesting five as a minimum but ten as
preferable. It also touches on the topic of statistical significance.
Regression Analysis Applied to Shotgun
Range-of-Fire Estimations: Results of a blind study. Authors: Fann CH,
Ritter WA, Watts RH, Rowe WF. This is another paper with some relevance to Shotgun-Insight. In
summary it says that pattern spread is proportional to distance
between target and shooter. This supports the validity of the scale
adjust feature of Shotgun-Insight.