It might be an idea to look up the chemical properties of various suitable small arms guns powders. Generally there are two types (single based) Nitrocellulose and, (double Based) a combination of Nitroglycerin and Nitrocellulose. There are others no longer made, Nitrocellulose can be wood based or cotton based. I don't keep up with this stuff too much anymore there most likely are other such as the newer IMR enduron and Hodgdons Copper fouling eraser type powders that might be made differently I don't know. Then mix in any of the Deterrent coatings either mixed in (built into the powder) or coated on, these powders along with shape , size, holes in them , how they are cut, or round, and the chemical make-up of each powder. Makes you wonder how they all come together. I kind of have a weird feeling about powder coating bullets to begin with, I know they are hard on bullet sizing dies if they re-strike. It's not that thick of a coating as per copper plated bullets which are left in solution and timed to get the correct thickness of plating and the better plated bullets are re-striked to correct size and roundness. Just food for thought let's say .003 thousanths rifling and .001 thousanths of powder coat, that rifling has to cut into or mush into the base metal somewhere . To what extent that's dependent on size of the bullet in relation to bore , type of rifling, condition of the bore, etc. Your old 100 year old military rifles have deep rifling sometimes .010 thousands , one of the reasons old corrosive primed military ammo works as well as it does and given the depth of these old Military rifling still shoot pretty darn well with old and new ammo even though the bore is pitted, rusted and looks like it's all shot out. New barrels aren't built this way and maybe that's a good thing, we sometimes make improvements as we progress. Let's face it pistol bullets are not that big of a deal or should I say mot as accurate as high end rifle bullets. I know IPSC shooters that wlll shoot 30,000 rounds sometimes before they wash out the rifling in their 38 supers or other caliber pistols, so if the shoots fine and easier to clean and is accurate enough that's a good thing.
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