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PostPosted: Sat Mar 08, 2014 10:47 pm 

Joined: Fri Aug 09, 2013 2:52 pm
Posts: 18
I did some measurements today on the Crosman 2240 air guns that I have. Temperature was 10 celsius. I was using Air Arms 16 gram diabolo field pellets. 12 g standard Crosman powerlets. an Alpha chrony was used for velocity measurements.

14 inch barrel RVA 1/8 inch out, steel breech, standard probe, standard tp and valve, p-rod trigger (and therefore a heavier hammer)
Most shots between 420-422 - fps not much variation in velocity with the RVA screwed fully in or fully retracted.

18 inch barrel with modified valve, extended probe, steel breech, drilled transfer port, 2250 kit, p-rod modification.
Velocities around 495-500.

10.1 inch barrel RVA with standard valve, standard probe, steel breech, standard transfer port, standard trigger.
384-390 fps. velocity adjuster didn't make much difference.

By comparison the 1701P shooting 7.56 H&N match pistol (177) had a velocity of 476 fps.

I'll do other measurements once it warms up.

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