From what I know, cast risers have very sloppy tolerances, like for example limb pockets, which should be very precise to add more accuracy to the bow. Cast risers are also more prone to air pockets, and contaminations in the aluminum making for a bow with less strength then a forged or Machined or Forged Machine riser. Machining is usaully done with a solid bilge of aluminum be it 6061-T6 or any other equivilent. The bar of aluminum has very little if anything in the way of air pockets, and or contamination. Machining is very precise ask any engineer about .00001 tolerances, limb fittings are precise, accesorie fittings are precise, and you don't have to worrie about stripping the fittings out because of soft aluminum or poor fitting measurements. Forging, it's what they do to strengthen the metal in swords. After forging aluminum you are left with very little in the way of air pockets or contamination in the metal, the molecules of the metal are actually pushed closer together, making for great benifits in strength, even more so then simple machining. When forging and machining you get the best of strenght and precise tolerances and fittings, High country and I beleive darton both Forge and machine risers. I think the most any bow that is machines is very very strong, as is forged machines risers, Im not a big fan of casting though, because I got up close and personal with the inside of a old PSE cast riser, and did't like the look of it very much. Good luck on your findings and good shooting.
Dylan

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