Cessna 310/T310C
Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 24; Flight Crew Total 514; Flight Crew Type 150
Situational Awareness
Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Gear Up Landing
Aircraft Aircraft Damaged
Human Factors
We departed on an IFR plan.  Upon arriving to [our destination] I cancelled IFR and entered the pattern for [the] runway appropriately but was too high and fast on landing so I performed a go-around; retracted the gear and flaps. Upon attempting the second landing; I forgot to bring the gear down.  The alarm went off but was not distinguishable from the stall alarm; which triggers at times upon touchdown.  The alarm stopped and as I continued to descend; it became apparent the plane was too low.  As I applied power to go around; I felt the propellers hit the ground.  Realizing I did not have enough runway left; I flew over the fence and brought the plane down on the field on the other side of the airport.  The plane slid less than 100 yards.  We exited the plane without incidents; all electrical devices were turned off as were the gas tanks. No other structures or individuals were injured.
C310 pilot reported landing gear up after mistaking the gear warning horn for the stall warning horn.