I'd just about bet that the guy that lost his family guns didnt follow the rules in some way. No, the Canadian customs people don't have much sense of humor, but if you follow their rules (it is their country after all) they are not too bad to deal with in my experience. I believe they hate for Americans to try to tell them how screwed up their laws are and how things ought to be, or try to claim what rights we should have in their country. Act like a courteous, respectful guest, and they have been plenty easy to deal with for me. Act like a heathen (in their eyes) and they can make your life miserable. Try to sneak things in and get caught, you can truly be in misery.
I've driven up and back several times, I thought it was a blast! I camped along the way. I declared my guns at the border, had zero problems coming or going (yes, I declared them on the US side before leaving also) other than one time they asked to see them, which I showed them, and they said "OK, have a nice trip". They each time asked if I owned any handguns, to which I replied yes, they then asked "where are they", and I produced the shipping receipt (from myself, to myself in care of a friend), to which they looked at it and seemed happy enough.
I believe you can take 2000 rds of ammo, a thousand primers, 2 kilos of powder per person. Check with the Canadian Firearms people, they have a decent website.
From all I've heard, the Canadians in western Canada are easier to deal with regarding guns than the eastern Canadians. If I were driving from somewhere in the eastern US, I'd get to western Canada before entering.