Found this nice article on how much is too much and how to store power & primers. Be safe out there.
Beartooth Bullets > Tech Notes > Smokeless Powder & Primer Storage
--EDIT--
Short Summary:
No more than 10,000 primers should be stored in a residence.
No more than 50 lbs of smokeless podwer can be transported by a private vehicle.
More than 25 lbs but less then 50 lbs of smokeless powder in private vehicle needs min 1" thick wooden box.
Under 25 lbs of smokeless powder can be stored in a residence in container it came.
More than 25 lbs needs to be in a wooden 1" thick or greater box.
-Jedi
Beartooth Bullets > Tech Notes > Smokeless Powder & Primer Storage
--EDIT--
Short Summary:
No more than 10,000 primers should be stored in a residence.
No more than 50 lbs of smokeless podwer can be transported by a private vehicle.
More than 25 lbs but less then 50 lbs of smokeless powder in private vehicle needs min 1" thick wooden box.
Under 25 lbs of smokeless powder can be stored in a residence in container it came.
More than 25 lbs needs to be in a wooden 1" thick or greater box.
-Jedi