In AMHA, hunter jumps are between 18-24". In AMHA, jumpers are between 18-26" on the first round, and jumps will be raised 1-6 in every round. The jumps may never exceed 44".
AMHR is different. Hunter jumps are between 12-24 if I remember right. (I don't show R so I always have to check the rule book.) Jumpers can only go up to 30" during a jump off and the jump off is timed to break any ties.
Hope this helps!
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