Hello,

This is probably not a question for this area, but I need to know where I could purchase cartridges from online collectors and that sort of criteria. I have been looking around, but I haven't found anything so far. Could anybody help?

Thanks

Looked on eBay? Any of the gun auction sites?

This is a Canadian site, but this list is of cartridges in the USA. There's lots of useful data here too.
http://members.shaw.ca/cstein0/4sale.htm

Bye
Jack

Try this link
http://www.gunhoo.com/gunhoo/a.antique-obsolete-collectible.htm