I am in the process of hand polishing a barrel for bluing. I began by sanding lengthwise with 100 grit. I will then go to a shoeshine method with finer grit and continue this process until I have a high polish. I ran into a problem though. While sanding with the 100 grit some spots showed up that appear to be some shallow pitting. Can I go to a coarser grit to remove the pitting quicker and then progress to finer grits? Is there a better method to remove this pitting? Any help is appreciated.