Or no limits!?
Sunny fires, rolls 2 blanks, adds 3rd blank. Uses lock to reroll all 3, rolls into 3 hits, adds 4th hit.
Yes/no?
The ridiculous edge case that prompted my uncertainty on this was suggested by my boy. Sunny with HLC, (or R1 bullseye AB), and a lock, rolls 4 hits naturally, adds 5th hit. Being a greedy so-and-so, he doesn't stop there. He uses the lock to reroll that 5th hit into another hit. Then uses her ability again to add a 6th.
Preposterous circumstance for sure, but still. Would it theoretically work?