I'm wondering what types of firearms would be impacted if explosives and combustion in general were to have a random chance of being more potent or less potent. Could new firearms and/or ammunition be feasibly designed to adjust for this random variability?
More specifically, the setting/world I'm working on has electricity and the associated tech disrupted instantly, while the combustion effect discribed slowly builds over about 10years time. At first the combustion effect has a low intensity and a low chance of occurring distributed in a bell curve favoring normalcy, but over time the chance and intensity of the effect increase with up to 90% burn variability evenly distributed. Assuming that technology level at the start of the 10 years is identical or higher than our own world, which types of firearms,explosives and other combustion dependent weapons would break down first?
The effect impacts everything and anything that is capable of burning or exploding, not just things that were made after the effect started, although slower burning combustibles (Wood for example) are impacted to a lesser degree. The effect is global, and stays the same for a few seconds at a time before randomizing again.
The effect impacts living entities considerably less than inanimate objects(to the point that life is not directly disrupted by the effects in any noticeable way). It is also localized as much as possible to just explosion pressure and electricity.