The phenomenon of exactly what causes cold bore eludes me. I have heard of a lot of people trying to go with HBN coated bullets and rifle bores to help that first shot stay in the main group. My understanding of that is to help alleviate cold weld of the bullet and neck. I don’t understand how subsequent shots after the first would be any less welded then that first round. What are some other reasons that would account for the dreaded cold bore flyer? Assuming you’re not shooting a freshly cleaned rifle, and it’s not shooter error.