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The art and joy of precision field target and airgun shooting. Photos, tech spec, reports.
"Airgunning" is the oldest Field Target website in Portugal. Online since 16-02-1999,
created and updated by P. Mateus . Copyrights apply.

Formulas and Conversions

To find out the energy of a rifle (pellet and speed)
fps x fps x grains / 450240 = ft/lbs

To convert ft/lbs to Joules
ft/lbs x 1.355817 = Joules

To convert Joules to
Joules x 0.737562149 = ft.lbs

1 grain = 0.06479891 grams = 0.002285714 oz (ounces)

1 Kilogram = 2.2046 lbs (pounds)

1 inch = 2.54 centimetres

.177 calibre is 4.5mm
.20 calibre is 5.05mm
.22 calibre is 5.5mm
.25 calibre is 6.35mm

Please ask permission to reproduce photos or text that are part of this website.
Copyright, from the  author or others apply to all media published. Website developed and maintaned by Pedro Mateus (Portugal).
Online since 16-02-1999 12:34:31. Last updated on 28-10-2007 17:22:58 . Top logo by
João Ferro Tique . Original photo from Lasse and Ewoodi .