There is usually other options at Gunshot.
Baz.
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There is also a bypass track that misses Gunshot Creek altogether. Looking at the map, you take the next right about 3km after Dulhunty River. The bypass is about 24km and brings you back onto OTL about 14km north of where you turned off. The bypass takes you past the Heathlands NPWS HQ.
Alternatively just go straight up the Development Road etc, and miss the OTL altogether