Bad Chrono... what should I do

[Tinsletown]

Good day all... My RT Pro's Chrono consistantly changes between let's say 220 and 300.

What can I do to have this gun shoot with a 25-30FPS MAX discrepency?

Any help would be appreciated...

TIA

[mrhooie]

are you chrono'ing the right way?

read this...
http://www.airgun.com/rtchrono.shtml

[Tinsletown]

Although this was a useful link..thanks.

When chronoing onto the field, my gun will come in at 225 - 278 - 295

all shots are @ approx 3-4 second intervals.

[puckmaster]

Are you using CO2? If you are, thats probably the problem.