I'm curious to know if anyone else here has ever thought about whether or not shooting gas checked boolits can create any measurable amount of copper fouling and if so, do you clean your bore more frequently when shooting GC'd boolits because of that copper? A lot of guys who shoot lead exclusively don't even clean their bores since they appear to season over time...
Also, it is a *generally* accepted fact that one should not shoot jacketed bullets without fully purging any and all lead from the bore for fear of "ironing" it into any imperfections in the bore. Vice versa, one should not shoot lead boolits after jacketed bullets without performing an extremely thorough cleaning of the bore to remove all copper fouling as the lead will adhere to it and foul the bore significantly faster than a "virgin" bore.
I wonder if a gas check leaves any fouling in the bore?