1st - glad to see anyone host a ML match of any kind.
For this match, it seems that holding in conjunction with a BPCR match makes some since (LRML has been that way in many matches). But, since it's a mid-range BPCR match, I assume it follows the NRA rules. If so, the ML match should follow the NMLRA rules (it appears other than the 'Sabot Only' some things do as well as the 100 yard target).
Did you happen to mention this in your discussions with the board?