I would recommend you spend some time in whatever gun shop in your area has a good reputation. Make some small talk with the owner or manager if possible. Don't expect the 18 year old part time help to have a vast experience base. Try to have the discussion with someone that actually has a significant interest in long term storage.

You are trying to learn and get some recommendations that actually work! You don't have to learn the hard way. The inexperienced clerk might, for example, recommend that you get into reloading to save money. The fact that the brand:model of handgun you have is known to be unreliable and unsafe with reloads will not be in his experience base.

The inexperienced BIG BOX clerk may knee jerk to "WOLF BRAND" ammunition because you used the "CHEAP" word. The fact that it may ruin your weapon is not of his concern. HE DOESN'T HAVE ONE!

Think about your questions carefully. Ask the question that will get you the information you are looking for.

i.e. - "...what type of ammo do you stockpile FMJ or JHP?..." My answer to this is - BOTH! My magazine for a bear in the tent has FMJ:JHP:FMJ:JHP:FMJ:JHP.................. My magazines for the next time someone hollers "HOLDUP" is Federal Hydroshok.

JHP - expansion, shock, damage
FMJ - penetration

I always equate ammunitions and defensive firearms to parachutes, brakes and heart surgeons - don't use a CHEAP one! If you ask for a CHEAP parachute, don't be surprised by what you get.

Now that you have the ammunition, storage is your next topic of interest. Ask your new friend about humidity, corrosion, chemical vapor, temperature and vibration.