| I think the key should be the pre-load on the limbs that produces the best force draw curve at your draw length. In my case, because of my un-naturally long draw (32.75") I find it best to have the limb bolts out as far as they will go and still tune the arrow for good flight. Those I've talked to about this with 28"-29" draws seem to do best with the limb bolts in about the middle. Short draw lengths (under 28") may find they get the best force draw curve with more pre-load built in, i.e. turning the limb bolts most of the way in.
Trouble is, limb length and riser length go into this as well as personal preference (some like a smooth draw, some like a harder draw). I don't know of any formulas beyond the very general guideline given above.
Dave
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Barebow Recurve Shooter
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