At least run a brass brush through it a good amount of times after each range visit ( replace the brush often and run it from the breach to the bore so the fragments don't end up in the breach ). That will help cut down on a lot of that build up that will occur if you are shooting all lead rounds on a regular basis. Lead is so soft it can't help but leave some behind with each round. Also inspect the bore frequently as well. It's pains me to here what some of you guys subject your guns to on a regular basis and do it without frequent and proper cleaning.