ORIGINAL: outdoorslover
For the record,I have loaded my ML 30 times without swabbing and haven't had problems. It will affect accuracy and loading to not swab but it's not mandatory. Just thought I'd let you know.
Straight from my manual:
Important: When using propellants that are sulfur free (Triple 7, Pioneer Powder, etc.), it is recommended that the bore be swabbed with a wet patch between every shot. Pay particular attention to the area of the bore where the bullet seats, as fouling buildup is heaviest in this area. This procedure is necessary to remove any excees fouling that could potentially lead to short starting of the bullet.