ArmySGT has sent me some more suggestions for the faults table. At some point when real life stops bothering me, I'll try to put together a chart that takes advantage of the bell curve property of dice rolling as per Legbreaker's suggestion. While this table has been specifically made in relation to mortar shells, with a little tinkering it should be usable for other forms of artillery.
Slow Burn... On impact, the casing breaks in two at the ogive . The explosive filler burns (no detonation) in a bright furious geyser of blinding white fire and throws off sparks. 50% chance of igniting combustible materials in a 5 meter radius.
Bad fins or imbalanced casting.... The shell fires as normal but, cannot be stabilized in flight by a imperfect casting. The random rules for a miss apply, triple the distance for a catastrophic failure.
Intentional ..... The manufacturer substituted the explosive filler for clay. Whether, to save money or hide failures may not be known. There cannot be a detonation on impact.
Fuse failure..... the fuse arming mechanism shears a pin and the shell detonates at its highest point (perihelion) as the nose turns toward the earth.
Hangfire.... Slow propellant ignition... The shell drops down the tube and impacts the firing pin.. There is wisps of smoke and the shell will fire in 1d6 minutes.
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