thank you for your information on this topic, here a quick review from the first visit to a 100m range:
Ammunition: Sierra 55grs SPBT Gameking Kemira N140 CCI SR PMC case OAL: 62,4mm
Rifle: Sauer 80, special barrel in match contour 72cm long / 28" (!) Leupold fixed 16power scope with a very fine crosshair
conditions: +5° Celsius, rain and strong wind
1st group starting load / 1st shot : bullseye ! 4 shots within 27mm
second group ( +1 grs more): 4 shots in 12,9mm
third group ( +2 grs more): 3 shots in 13 mm, plus one flyer opening to 45mm
fourth group ( +3 grs more): 4 shots in 30 mm / primers getting flat => test stopped
Now I will retest the loads with +1 and +2 grs and in between, try other seating depths, selected/weighed cases and of course, benchrest primers.
As Ripp stated before, this might be a cartridge for even larger game than foxes, e.g. roe deer on grass plains at longer ranges :-)
@ Nitrox: prefered roe deer cartridge (highly biased) I had very good results with : - 7x57 with a 140grs Ballistic Tip at 780 m/s - 9x57 with a 250grs SP at 640 m/s - 9,3x57 with a 225grs RWS Doppelkern at 700 m/s
The standard 308 Win is too much / too damaging with the 150grs bullets, but loaded down to ca. 710 m/s a very fine and recoil-friendly cartridge for this small game And: 9,3x64 with a 250grs Accubond at 800 m/s gives results, but might be on the overkill side...