Originally Posted by Vincine
So it's about lead exposure to the range, not to the pistol?
Correct. Whether or not the base of the bullet has exposed lead will matter not to your barrel. How often you need to clean your gun depends on the standard of accuracy/reliability you require. When shooting jacketed bullets, whether theyre fmj or tmj, your barrel will have copper and powder fouling inside it. No lead residue will be left behind from either one.
Copper fouling will kill your accuracy. So again, on this point, your cleaning schedule will depend on your accuracy requirements. I have run 500 plus rounds through my ar and my handguns at a time with no problems. I dont require exceptional accuracy from them. "Combat accuracy" is all i require from them. My bolt rifles will be cleaned every 20 rounds. If not, i will notice a huge decrease in accuracy. These rifles i hold to a much higher standard.
Powder fouling is corrosive and will cause rust if left uncleaned. Powder fouling is why we clean our guns after every range session.
Non corrosive ammo means that the primers are non corrosive. But burnt gun powder IS corrosive regardless of what type of primer ignites it.
Always clean your guns after every range session and then run an oil soaked patch through the clean barrel to protect it during storage.