Generally Nosler's BC numbers are pretty accurate these days. Bryan Litz recently tested some Long Range AccuBonds and found the BC's to be good--as long as the twist was adequate to really stabilize them. The typical .25 1-10 is plenty for stabilizing the 100 .25 E-Tip--or at least it is in typical Montana conditions. Sea level might be another story. It will still stabilize, but not as thoroughly as at higher elevations.
