Discussion
Hang fire is :
Answer: B
The key gives due to lower loading density.
A hang fire is a delay between the firing pin striking the primer and the propellant igniting, so that the shot goes off late. The loading density is the amount of powder in relation to the volume of the cartridge case. When the density is low, the powder sits loose in a large air space and the flash from the primer may fail to ignite it at once, which gives the delay; reloaders report this for low loads in large cases, though I found no controlled study.
The other causes named for a hang fire are an aged or damaged primer or propellant, which the options do not offer. Option A, higher loading density, is the opposite of the keyed reading, and C is not a definite cause. Option D would deny any link to loading altogether. The key is the University's and rests on this reading.
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