Hi
I have an SMK PR900W rifle in .177 that I have detuned to 7ft.lbs. I'm not happy with its 25 yard accuracy. The barrel is not choked and pellets that are seated and then pushed back out with a cleaning rod show only light rifling engraving. That is with JSB Exact and Bisley Magnum pellets. I was wondering if there are pellets at the upper end of the .177 diameter that would
shoot better. Does anyone know if there are oversize pellets available?

Thanks