Soft Lead Slugging Bullets, bag of 10The very best way to check the bore for constrictions, loose spots and rough spots is to "feel' the bore. The best way to "feel" the bore is to manually push a slug through the bore. As you push the slug through a well greased bore, you can note where the aberrations occur and mark them on your pushing rod or dowel. As you change grits in the fire lapping process, slug the bore. You will feel the improvement brought about by the firelapping process. SHIPPED VIA SMALL FLAT RATE BOX ($10.50).