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Pellet speed
Posted: Wed Feb 28, 2018 3:19 am
by 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
Re: Pellet speed
Posted: Wed Feb 28, 2018 10:42 am
by 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.
Re: Pellet speed
Posted: Wed Feb 28, 2018 11:05 am
by Roger5
RWS Hobbys are 7gn in .177
Re: Pellet speed
Posted: Fri Mar 02, 2018 9:27 pm
by 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.
Re: Pellet speed
Posted: Sat Mar 03, 2018 6:01 pm
by pjgtech
Chairgun is your friend here...
Re: Pellet speed
Posted: Sun Mar 04, 2018 4:18 pm
by gary martin
pjgtech wrote: ↑Sat Mar 03, 2018 6:01 pm
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.
Re: Pellet speed
Posted: Thu Mar 15, 2018 7:24 pm
by SorenSD
My new TX200 MK3 .177 FAC is pushing an average of 903 FPS with JSB Exact 8,44 GR
