Just checking into the grit. There's loads listed on eBay for blasting/sanding/tumbling, usually around £8-10 for 5kg plus £5-6 postage. But you can also buy crushed walnut as a pet supply. It's used in reptile vivariums for keeping snakes and lizards which means you should be able to easily find it at you local pet shop.
http://www.ebay.co.uk/itm/Purrfect-Pet-Products-Ground-Walnut-Grit-5-Litre-/291174548445
As it's for pets it's untreated so you have to add your own polish if you want to, e.g., Brasso.
You can also use crushed corn cob which is less aggressive than walnut and gives a better shine. In the world of "reloading" (no surprise it's a major US pastime of cleaning and re-using gun cartridges...) corn cob is used to polish cases than are either new or only fired once since their last clean. Walnut is used to clean cases that have been reloaded several times or on "range pickings" that have tarnished heavily from being left outside.
So, for me it looks as though walnut is the way to go for the initial heavy-duty cleaning and I'll do the job of corn cob manually with my Dremel. But better
http://www.ebay.co.uk/itm/Purrfect-Pet-Products-Ground-Walnut-Grit-5-Litre-/291174548445
As it's for pets it's untreated so you have to add your own polish if you want to, e.g., Brasso.
You can also use crushed corn cob which is less aggressive than walnut and gives a better shine. In the world of "reloading" (no surprise it's a major US pastime of cleaning and re-using gun cartridges...) corn cob is used to polish cases than are either new or only fired once since their last clean. Walnut is used to clean cases that have been reloaded several times or on "range pickings" that have tarnished heavily from being left outside.
So, for me it looks as though walnut is the way to go for the initial heavy-duty cleaning and I'll do the job of corn cob manually with my Dremel. But better