so i got my loading port cut on my 58 i used the finest sand paper drum i had for my dremel on the last few passes but it still looks rough. whats the best way to get that mirror finish before i blue?
Yes. Jeweler's rouges are special fine grit polishing powders that are sometimes sold as Dremel polishing accessory kits.
Jeweler's rouges can be also be purchased separately or there are similar polishing compounds at auto stores. For instance, there's valve grinding compound and buffing compounds of various grits. But they're not exactly the same as jeweler's rouge which is sold in powder or block form for mirror polishing.