WASHINGTON (Reuters) - Wholesale inventories rose more than expected in April, as durable goods stocks grew the most in nearly a year, a Commerce Department report showed on Friday. Total wholesale inventories increased 0.6 percent to a record $483.5 billion, after an unrevised 0.3 percent gain in March, the department said. Economists polled by Reuters had expected stocks of unsold goods at wholesalers to rise 0.4 percent in April. Inventories are a key component of the government's calculation of gross domestic product. ...