Bullseye match, 900's rim fire, 1800 & 2700 usually include 2 center fire legs - one a 45ACP.
Some allow all shots to be rim fire.
10 shots slow fire (10 shots in 10 minutes), 10 shots Timed fire (5 shots in 20 s) and 10 shots Rapid fire (5 shots in 10 s) - repeat x3 --- 90 shots 900 total possible points. repeat with center fire....