What I've found interesting thus far is that no one has addressed the primer limitation issue. If my understanding is correct, then anyone storing more than 10,000 primers in their home is quite possibly violating the law and exposing themselves to possible insurance problems in the event of making a claim. Rather than address this directly, the responses so far seem more along the lines of ignoring the issue rather than understanding and confronting it, if needed. That surprises me a bit as it is inconsistent with my general impression of the members here.
I think the main reason is because when I was doing my research I never once thought about the number of primers. That thought comes because as a "Haz-mat" item primers and powder are looked at as the same. Until you brought it up I have always looked at both from a weight perspective and not a number.

I can put 50lbs of powder/primers on one ticket. 50lbs of primers is like 70-80,000 or more. I truly believe that when you start digging that you will find that the limitations that you have found in print mainly apply to a business. I do know about the powder limit "for display" that is out there but to be honest when it comes to the insurance issue I look at it as you have it or you don't.

Unless the point of ignition started at the storage site of ones powder and primers it would be a moot point IMO and we have many here in the industry that could chime in on this.

I like to think that common sense applies in that after ones house burns to the ground that some inspector would not be trying to count primers to get over 10,000 to deny a claim. I do not believe that most here are ignoring the issue but take a different look at it because I know I do.

Being one that has these items and also restores cars I have many items that are flammable. I also have taken precautions and have implemented fire control and prevention measures. There are only two outcomes at my place. A fire that is quickly put out and damage is minimal or it all burns to the ground. this has already been proven once here about 13 years ago by one of my children and his training after he screwed up worked and the damage was small.

You have found an issue that you want a black and white answer to and I am afraid that you will only find shades of grey. I wish you luck in your quest and please do give us updates on this.