Raimey,
you should shoot with open sights at 50m. Allow the barrel to cool properly after each shot. This way you make 5 shots. The scattering circle should remain under 10 cm. Brennecke guarantees this in the so-called "Langenhagener Norm". 4-5cm are good values!
The Langenhagen standard states that for appropriate hunting, the scattering circle with the "BRENNEKE" must not exceed 10 centimeters with five shots at 50 meters - even with combined barrels (coasters). With Drillings, the total scattering circle of all three barrels should not exceed 15 centimeters.
Try many different brands until you get the best results.
Cheers,
Wolfgang
