I have no experience with lead build up in a 22 bore. But every now and again you hear of it. My question is. I shoot CCI SV a Lot and have recently switched to Federal Auto Match these two have a lubed lead bullet. I have also shot a lot of bulk federal 550 with the copper coating on them. I never shoot Remington. The lead bullets with out the coating on them, as anyone heard of them leading up a barrel ? I like the lesser velocity stuff for accuracy or is the copper coated best ?