If your house is burning down and bullets explode guess what the fire department will not do?
As a best practice, dont store the majority of your ammo in your gun safe.
As a former firefighter, i could handle ammo cooking off ‘open air’ but ammo in a safe might case the safe to ‘explode’ when the ammo inside reaches ignition temp.
My 2 cents.
“If your house is burning down and bullets explode guess what the fire department will not do?”
Internet old wives tale to claim they back off. Fire departments already know the ammo results in no velocity of the bullets.