At no time during accelerated break-in tests can a composite bat exceed the BBCOR limit. Composite bats can only get to the limit at .50, after that, they fail. At the bat’s highest performance level, it must be below 50 BBCOR limit. With BBCOR approved bats, the average seems to be .48 or .49, and at the very upper level, .50.
What these figures mean is that there is virtually no trampoline effect for non-wood BBCOR bat barrels. From a trampoline aspect, the barrels react similar to wood. A wood bat is essentially a perfectly hard surface. When a ball hits a wooden bat, it has the same trampoline effect as a ball hitting a massive, rigid floor. Roughly speaking, that translates to about 5-miles per hour less off BBCOR bats (when compared to BESR standard bats) which is similar to wood bats.
The Moment of Inertia (MOI), or 'swingweight' of a bat, is less than a wood bat. This means an Alloy or Composite bat will be more easily maneuverable.