Dan:
The URL you used is to a directory, not a single image. Can you do it for each image?

Normally you could just give the URL without the [img] delimiters, like this:

http://nz.msnusers.com/myriflepics

and we should be able to go to the directory by clicking on the URL, but in this case there seems to be some problem with security or access. Cutting and pasting the URL into the address-bar works for me, but clicking on it doesn't work!

Nice rifle by the looks, but only you will have access to the URLs for the full-size images. Hope you get it sorted.
Cheers