Approx 80 shots from the X2R. AFAIK it comes with several stock options; synthetic, wood ambi, r/h, l/h, thumbhole blah, blah...
If your m8 is venturing into MFR territory, I'd recommend the Mk3 Sporter at £699 which can also be upgraded to FAC levels later. In 12ftlb guise it gives over 100 shots/charge and at 30ftlbs 45 shots.