Discussion in 'General Airgun Chat' started by BDL, Jun 27, 2014.
Going to try some express Sunday but how fast can they go to be legal in a GP?
from memory, 820 fps
Hi hear is a web site,
that you can put in pellet weight and the speed to see if power is legal or not.
Im going onto them myself as can up the fps by about 40fps.
Cheers Si think it was about 810 so will check again tomorrow
try this site....
Useful site cheers, they grouped well the other day testing and chrono was very consistent too so I can up it a little too.
Group best between 805fps
Leave it alone
There is nothing to be gained by turning up the power,if they group we'll then leave the power where it is.
I ran express through my Walther at 800 fps with great success,it's a misconception that things need to be run flat out.
I'd agree I wouldn't run them flat out as it's never good
I meant 795-805
Okey dokey mate
Yeh. I've found no benefit to running them tight up. 800 is where I set mine. It gives a safe margin for chrono pellet and gun variation, and uses less air, kicks less. The amount of wind it takes or range you can is imperceptible. I won the csfta winter league running express at 770.
Just got in and they are settled at 798 and grouping well, my 55 has changed down from 14 to 13 everything else is the same.
Is that normal ?
Up to 50/55 yards my MPR's dont change POI from 7.9 to 8.4 AA/JSB's.
I think that they might just have a yard shorter first zero thats all depending on the gun.
I just find that in any wind they go all over and not as predictable as the 8.4's, although I cannot prove it other than what I have seen occasionally on paper. Thats another debate though.
I ran Jsb 8.4 and 7.9 of the same click chart,others will argue this but it is correct.
Which takes more wind
Which takes more wind a jsb express at 7.9 grains traveling at 810 fts shot from same rifle say a steyr and also at the same distance say 40 yards or does the 8.4 grains exact traveling at 785 fts take less wind. The wind is a full value wind at 10mph. Any ideas anyone ????????????
nothing between them in my experience.
Depends on the pipe they're being pushed through.
Very difficult to prove one way or the other with real world testing. The variability of conditions makes it almost impossible to conduct an objective test.
both pellets shot from the same rifle on the same day so no temperature differences only thing is different is the feet per second value and weight of the pellet ????
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