My experience...
with Benchmak is somewhat limited but this is what I have found. Shooting a 6ppc, Panda action, Kreiger .237 4g, and Gentner 65bt at 73* - 78* and 60% - 50% humidity, 30.6 gr was for sure the upper window. I would not go any hotter than this in my rig. The powder comes to the bottom of the neck with a slow drop and an 8" drop tube. On my Harrels powder drop this is at 52 3/6 clicks. This evidence is with only one lot of powder so others need to be cautiously checked. I have no idea if this is a slow, med. or fast lot of powder. I will tell you this, it shot very well at this setting and I will be shooting it a lot more this season. In a club match last season this load shot a .2668 grand agg which was good for 1st place and three small group pots at 200. Bro.D