A few months back I was having trouble getting some snuffers to where I think they are sharp enough to hunt with, which is hair shaving sharp. Some fine people gave me some tips and I'll share with you here.
1. With a black magic marker, mark each cutting edge.
2. Place a bastard file on your bench and using light stokes drag the head backwards on the file until all the black ink you marked in the first step is totaly gone. By this time you shpuld have raised a good burr on the edge. Flip the head and repete until you have all 3 sides done in this way.
3. When you have all the black ink gone from all sides of the head, switch to some Arkansas stones. Make sure to use plenty of oil on the stones. I started with 30 strokes per each side of the heads and after the first 30 strokes, repete the process reducing the strokes to 20, than 10, etc, etc. Do not use heavy pressure!
4. The next step I took was to put some Mothers metal polish on a piece of cardboard and lightly strop each side of the head with simmilar steps of step #3.
5. Last step is to strop each side of the head on plain cardboard. The edges should look shiney/polished and will be able to shave hair easily.
I think the total time per head was somewhere close to an hour. But the results of how sharp they came out was worth it to me.I hope this helps you get your Snuffers sharp.