Mike, it's pretty simple. Just fill in the required Canadian form and have it in triplicate. Present it to Canadian customs at port of entry. Also suggest you present your guns to US customs before leaving. They have a form to show you are the owner of the guns. Possibly eliminate headaches coming back.

Oh, I believe you are restricted to 200 rounds of ammunition on entry.

Here is the Canadian form:

http://www.rcmp-grc.gc.ca/cfp-pcaf/form-formulaire/pdfs/5589-eng.pdf

And the US form:

https://www.cbp.gov/sites/default/files/documents/CBP%20Form%204457_0.pdf

John McCain is my war hero.