My NEI SWC casts a 154gr bullet.On top of 3.8 Titegroup,it'll fly over the screen at a little over 900fps(904 if I remember correctly;excuse me if I don't run out to my shop to retrieve my notes)out of a 6''tube.
When I want to go +P route(which I use in my 4'' model 13),I go the 6.0gr Power Pistol way with the same bullet.Using slower burning powder makes me feel better insured against sudden sharp pressure increase of the quick burning powders.