If you can find any in the classifieds on AT the best option is Nitrous cams.
Surprisingly these are very smooth drawing cam with 75% letoff and a bunch of speed.
I had a 2004 Slayr that produced speeds in excess of 300 fps (IBO setup) at a 27" draw and 53# lbs. Martin doesn't make the Nitrous cams any more so they are hard to find.
The newer M2Pro cam might be a bit faster but not so much to justify the cost.
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