SACRAMENTO — California lawmakers Thursday voted to require weapons manufacturers to ensure that all bullets and cartridges are branded with distinctive serial numbers. Contained in two measures that are intended to help law enforcement solve cases, the proposal would be unique among states if approved by the Legislature and signed by Gov. Arnold Schwarzenegger. The gun industry said the proposals were impractical and would force weapons makers to either write off the huge California market or adopt practices that would greatly increase the cost of their wares. (snip) On the weapons measures, though a number of law enforcement officials backed...