• 1974 - aluminum bats introduced. The aluminum baseball bat was introduced into college baseball in 1974 as an economical answer to rising costs of replacing the large number of wood bats that were being broken during a season. The first aluminum bats were heavy and did not perform much differently than wood bats. However, advances in aluminum alloys enabled the design of single-walled metal bats that soon began to significantly outperform wood bats.
• 1986 - weight limit. Concern about the increase in bat performance and the impact that metal bats were having on the game of baseball, the NCAA imposed a lower limit on the weight of a bat. This wasn't technically a performance standard (batted-ball speeds were neither measured nor regulated) but the fact that hollow aluminum bats can be made significantly lighter in weight than solid wood bats allows for a greater bat-swing speed and better bat control. The NCAA restriction on bat weight did cause bat performance to drop for the next several years.
• 1999 - BESR standard. During the early 1990's several governing bodies and manufacturers had been discussing the regulation of bat performance. After the 1998 season - during which a large number of scoring records were broken - the issue came to a head, and the NCAA adopted the BESR (Ball-Exit-Speed Ratio) standard to regulate the performance of aluminum and composite bats. In addition, the NCAA instituted a reduction of the maximum barrel diameter to 2.5-inches, the "minus-3" rule on weight -- which means that the difference between the weight of the bat (in ounces) and the length (in inches) can be nor no more than 3 integers -- and a lower limit on the bat's moment-of-inertia.
• 2009 - composite bat ban. During the 2009 College World Series the NCAA discovered that a large percentage of BESR approved composite bats were found to significantly exceed the performance standard after being broken in through use. In July 2009, the NCAA imposed an indefinite moratorium banning the use of composite bats.
• 2011 - BBCOR standard. After extensive laboratory testing of a large number wood, metal and composite bats, and based on the scientific evidence and arguments of several researchers including Dr. Alan Nathan and myself, the NCAA abandoned the BESR standard and replaced it with the BBCOR=0.50 standard. This new BBCOR standard effectively requires non-wood bats (metal and composite) to produce batted ball speeds no greater than wood.
With that knowledge, look closely at the NCAA DI baseball records.
http://fs.ncaa.org/Docs/stats/baseball_RB/2012/D1.pdf