Abstract: A firearm (10) constructed in accordance with the principles of a preferred embodiment of the present invention and configured for firing large caliber ammunition at precisely defined targets at long range is disclosed. The firearm (10) broadly includes a stock (12), a receiver (14) supported in the stock (12), a barrel (14a) threadably coupled to the receiver (14), hardware (16) associated with the receiver (14) for firing ammunition through the barrel (14a), a scope (18), and a scope-mounting base (20) coupled to the receiver (14) for mounting the scope (18) thereto in the line of sight. The base (20) includes a mount (24) adapted to be fixed to the receiver (14), an adjustable recoil lug (26) for anchoring the base (20) relative to the receiver (14), and a pair of ring clamps (28 and 30) for coupling the scope (18) to the base (20).