After the obligatory "scragging" spring, the power is about 35J. A new spring from the factory with dieseling can give more energy, but it's all just a delusion ...
Only 28fpe?
Shane, I think that accounting for elevation would mark your rifle as superior to mine in fpe.I dont have a definitive conversion factor to use but from what I've read that 4,000 foot difference in elevation should result in an 8-10% loss of velocity. That would drop my results with the JSBs down to around 675 fps, for 25.7 fpe.Like I said, maybe mine will pick up some velocity as it breaks in. Do you recall what energy levels your rifles produced when you first got them?
I'm a fat old guy with a desk job