if you own a general production gun, NO. but, if it is an autoloader, you may want to give it 100 rounds or so for the mechanism to break in. but, if you have a super high dollar custom target gun, then, it might be worthwhile. on a side note to this, if the barrel is just plain rough (deep machining marks) you may want to consider useing something like the David Tubbs Final Finish System. it is a specific amount of ammo (or bullets if you reload) that have a abrasive compound imbedded into the bullet. it polishes the bore by shooting the rounds. they start out with a coarse compound, and work their way finer. if your bore looks fine, you probably will not need this, but i had one that looked like it was made with a chisel (of course i am exagerating), and it helped a bunch!