No indoor magazine is to be located in a residence or dwelling
I suppose this only applies if you are required to have a magazine in the first place. I wonder how they would act if you had a magazine but only had 5 lbs in it. On one hand, you have one and it is illegal to have it in your house. On the other hand, you don't have enough powder to require it to be in a magazine in the first place. Gray area.
Ian
You have to be careful to read BATF regs in the correct context.
There is a 50lb possession limit on BP stored in single family dwellings to be used for recreational purposes.
There is no license or storage requirement for up to these 50lbs in a single family residential dwelling.
Your state may add additional regs.
While I fully respect BP, and use nothing but Goex year round in various Flintlocks, it is not nitroglycerine, not magic, etc...after all, when I buy a 25lb case of it at a time, it's shipped to me cross country in a simple cardboard box.
I store it in the bottom of a closet in the cardboard box it arrived in, along with various other hunting / shooting items, where it is out of harms way.
By the time any fire ever get big enough to heat up and ignite that BP, it would have had the house so totally engulfed in flames by then that I would have long since died from smoke inhalation, or will have gotten out of the house, or been away from the house, etc...
The format of the BATF regs is difficult to follow sometimes, but you are free and clear to buy and have in your single family reesidence up to 50lbs BP, no license, no magazine, etc...even the post 9/11 Patriot Act did not make any changes to the recreational-use section of the BP regs.