Pellet speed

[RonnieD]

I do not own a chrony, could someone give me an estimate of the FPS of an air Arms .177 diablo 8.4 grain pellet shot out of a new, stock, U.S. tx200 mk3. Thanks. It shot 995 FPS with diablo basic 7.0 grain pellets at pyramid air when it was purchased

[tonyc]

Are you sure it was 7.0gr? it's not a weight I recognize - 7.90gr is common.
7.0gr at 995fps is 15.39ft lbs.
At the same energy 8.44gr will be 906fps.
In a springer, heavier pellets are normally a little less efficient so you are probably going to get a little under 900fps.

[Roger5]

RWS Hobbys are 7gn in .177

[FPoole]

With the 8.4 grain Exacts, I've seen U.S. FAC spec guns as high as 960, but I would say 920-940 is more typical.

[pjgtech]

Chairgun is your friend here...

[gary martin]

Chairgun is your friend here...

chairgun is a useful tool, but you really need to work your own BC value out, as the ones quoted in the database are an average.

[SorenSD]

My new TX200 MK3 .177 FAC is pushing an average of 903 FPS with JSB Exact 8,44 GR