This maybe an off topic question, but it deals with Reballs and inserts. Brass is a good material for inserts because the coefficient of friction between it and actual paintballs is pretty low. How about between brass and Reballs? I don't have any experience with Reballs. What is the "shell" like? How do they function through brass inserts? Is this even an issue?
FWIW, I use an insert form tymcneer, and it is by far much better than the Freak aluminum inserts in terms of efficiency and accuracy. Not actual data... Just anecdotal observation between the two. It's a .678, and I routinely use DXS recsport at my FPO only field, which runs .680-ish(on a good day!)
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