Oregon Revised Statutes Agricultural Marketing and Warehousing § 587.160

Whenever the amount of grain certified to on the warehouse certificate has been computed by cubic measurements or by number of bags, the amount shall be deemed to be prima facie the amount of the grain, but the actual amount shall be determined by the actual weight thereof. The owner, however, is responsible and liable to the holder of the certificate, for the delivery of the amount of grain indicated on the certificate by actual weight, or the value of any shortage thereof.