Tuning Velocity loss

[Mm89]

Hello.

I have the following problem:

I set my Prophet Performance to low power (regulator at 95 bar and removed the spring guide).
During my last session, I set the rifle perfectly for my needs (240 m/s with a JSB Exact 14.35 gr).

When I shot again today, the velocity was consistently only 215 m/s. (Same pellets, cylinder pressure was where I left off last time (approx. 150 bar).)

Does anyone have any idea why the rifle is suddenly shooting at a lower velocity even though all parameters have remained the same?

(Measured with an FX Pocket Chronograph V2)

Regards, Max

 

[1handwill.gc]

Would you prefer setting it up yesterday? Were you going down on the regulator by steps or you went all the way down then start working your velocity up sometimes when you’re working it down little by little that happens.

 

[1handwill.gc]

Don’t worry sometimes it takes a minute or two for everything to settle down, but if it’s still too slow, yes the hammer until you get to the velocity you want