Tesla has reported that it only managed to ship 260 Model 3 cars in Q3, some 1,340 units short of the target for the quarter, citing bottlenecks in the supply chain as the route of the cause. But optimists should bear in mind that the battery form factor Tesla is currently using could make it difficult for the company to ever scale production to the 500,000 unit per annum target – according to industry skeptics. Even with the poor production news, Tesla’s stock only dipped slightly before returning to its average price in August of $355. Wall Street is clearly unperturbed by Tesla’s tardiness on production targets, remaining bullish on the long-run performance of the vehicle. A report in the…