The trail to this cache is very rocky and wet. Stay on the trail for this one -- bushwhacking here is tough. The trail wanders in a direction that seems off course, but it gets you there.
From Route 9, take Haystack Road. Take the second left onto Chimney Hill Road. Turn right onto Binney Brook Road. This winds steeply up. At the stop sign, turn right onto Upper Dam Road and bear left at the next intersection. The trail head (see parking coordinates) is on your right, marked with a Haystack Trail sign.
Begin the hike on an old, rocky road. After about half a mile (Waypoint 1), turn left off the road. Do not continue to the reservoir. There's a micro cache (Needle in a Haystack) along this section to get you started.
Follow the trail as it heads south and then begins to climb onto the ridge, eventually heading northward. At the next trail intersection (Waypoint 2), turn right and begin the last climb to the summit.
The GMNF states that the trail is 4.8 miles round trip and averages 3-4 hours. My own hike today was actually 4 miles and took me less than two hours, up and down. Allow enough time, wear waterproof hiking boots, prepare for icy trails if it's cold and stay on the trail.
The ammo can you are looking for is out of sight of the summit view. Some scrambling and bushwhacking may be required. The cache is not winter friendly, but it's in a location where you might be able to dig for it, if you come prepared. This is a great snowshoe hike in the winter. There is also a bench mark and two reference marks on the summit.
There used to be another cache here, Haystack Hike, GCH1PN. It disappeared and is now archived.