For years I have heard the guesstimate that 10% of gun owners are reloaders. I have no idea where that number comes from, could be somebody removed it from his anal orifice and liked the sound of it. I am always dubious of convenient round numbers but it is one of those things that would be very difficult to track scientifically. that being said, based on my interactions with gun owners and modest to heavy shooters, it sounds pretty close to me.