I use a slightly faster powder.  Big flakes, 10B101 (surplus Vihtavuori powder for 50BMG plastic training ammo).  The flakes pretty much stay in place in the middle of the big logs of 7383.  Very little to no compression, but a caseful with the bullet weights I've so far worked with.  The loads I've worked up are very accurate.  Sorta odd to be able to grab a case as soon as it comes out of the rifle and not get burned by it.  It is a real pain to weigh out three charges per case though!