Theory on the Kiloton Cannon Bug

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I have stated that a theory why Kiloton shells don't prime straight after they leave the barrel. If they were to, they would run the chance of damaging the ship they were fired from. This may not be so much of a deal for small craft, but the Ranx use in on a large Dreadnought. The main purpose for it is to clear out enemies from a distance, but should the enemy get that close, there is a severe chance of, say, a Sandstorm battlepod running in front of the barrel if the Kiloton Cannon, the shot priming as soon as it leaves, and exploding pretty much as soon it gets out of the barrel, causing damage to pretty much everyone. So Ranx Imperial Space Fleet, or whatever is using the Kiloton Cannon has extended the fuse a bit. My question: does this whole scenario make sense? And for the Devs, why does it actually do that?