With the 55g BT's for max range and vel I use the max load listed on the Varget jug with WW brass NOT mil brass and I also include PMC with the mil also. With the Mil brass like Lake City I usually back off .7 grains at least. There is around .8-1.0 grain difference in internal volume from commertial brass and military. WW holds the most, Fed is next then Rem but for all general loading they are very close. Just have to follow gerneral loading practices and work up! For accuracy the H335 get's the honors with 25.0 grains under a 55g BT.
The Varget loads are around 3350 and group around a inch. The H335 loads run around 3150 and group about .70
This is out of my Win M70 w/24" bbl using WW primers.
I tried some Ramshot Exteminator but wasn't really impressed. Need to work on it a bit more though and try a few more combo's.