I'm pretty new to handloading (9 months), and centerfire pistols (1 year). The manuals that come with new pistols (Glock and Springfield in my case) state that the warranty is void if you shoot handloads. I was worried that I could not get my pistols repaired under warranty as I only shoot handloads. I was having some trouble with a new Glock 42, took it to the Glock factory in Smyrna Ga. The armorer that met me said as long as you don't blow it up, Glock does not care if you shoot handloads. Glock fixed the pistol for free in 45 minutes. My Springfield Range Officer 45 cal was having trouble. I called Springfield, they asked what ammunition I shoot, I said handloads. Springfield paid the shipping both ways and fixed the pistol for free. I am no longer going to worry about handloads and pistol warranties.