The Tubb Final Finish Bore Polishing System is composed of a series of 50 bullets that are impregnated with 5 different progressively finer compounds. Enhances accuracy by polishing out bore imperfections. The smoother bore results in reduced fouling and less drag. Also makes the barrel much easier to clean. Removes no more than .0003" of metal from the bore and includes a reusable plastic case. This is not loaded ammunition. Reduced loads must be used when loading Final Finish Bullets. Bullets are made by Sierra. The grain weight of the bullets will be listed on the end of the package. Tubb recommends using the starting load listed in the Sierra reloading manual for that grain weight and bullet. Tubb also recommends not to go above the starting load for any reason.