Walt doesn't seem like someone willing to commit suicide though, so maybe that's why the car bomb idea wouldn't work for him. That and it's just as inefficient as the gun would have been, who knows if detonating the bomb outside the house would have killed all the occupants inside. He needed a 100% success rate as if anyone had survived they likely would have gone after Skyler and his family as retribution. In that way I honestly think the rail gun works a heck of lot better than a bomb.
Then of course you need to consider resource management and that maybe it was easier for him to just buy the gun and create his spring contraption, rather than finding all the materials (and taking the time) needed to build a bomb capable of taking out the entire gang of Nazi's. He was under extreme time limitations as the cops were on his trail after he left NH. Really he was put into a now or never situation, and using the gun was his last (and easiest) resort.
That and an explosion killing off the main characters would have been a real letdown ending for the series.
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