Looks like it's the Concussion and Burst numbers that are throwing you off. See the rules under "Explosions" and "Descriptive Terms" (p.197 in my v2.0 BYB).
Concussion, C is the number of dice rolled for damage if someone/something is hit directly by the round.
Burst, B is the primary burst radius, in meters, for the explosion; secondary burst radius is twice the listed number.
Penetration is a separate rating, but it may also have a "--C" if the round in question is an explosive one.
The M12 SMAW rating that you cite would do 2d6+55 points of damage to any vehicle that it strikes (less the armor, per the Vehicle Damage Resolution table).
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My Twilight claim to fame: I ran "Allegheny Uprising" at Allegheny College, spring of 1988.
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