Just for conversation, here's chrono results I've had for four different bullets, all loaded with 50gr RL17, in the same 20.5" 308, same Winny brass.

180gr PSPCL, 2.80" OAL - 2595 fps

200 Accubond, moly'd, 2.82" OAL - 2620 fps

200gr Sierra GK, 2.81" OAL - 2620 fps

208 AMax, moly's, 3.00" OAL - 2620 fps