The biggest issue we have in Australia (IPSC) with plates is the method of set up and sizes at different clubs, they must be set up so they cannot turn side on but must fall when shot. Sizes are in the rules but clubs sometimes just use what they have and then when the stages get inspected prior to the match, the sh*t hits the fan as they don't have enough of the required size. Unfortunately it's sometimes the clubs that actually run L3 matches every year that are at fault.