Mont. Code § 80-4-523
A warehouse operator must receive for storage, conditioning, handling, or shipment without discrimination of any kind, so far as the capacity of the operator's warehouse will permit, all agricultural commodities tendered to the operator in the usual course of business in suitable condition for storage. However, a warehouse operator may not be compelled to accept and hold agricultural commodities for storage in quantities that block the operator's regular cash agricultural commodity business. A warehouse operator may not be required to accept agricultural commodities for storage in excess of working capacity. However, the operator's appointment of space may be modified by rule upon proof that the appointment operates to the disadvantage of either the public or the warehouse operator.
§ 80-4-523, MCA