Okay....after struggling with getting the proper powder charge, I finally decided to try the stacked disks. With the single 1.57cc disk, here's what happened:
If I ran the turret around as if I were loading quickly, the powder charge would almost always be consistently over 24 grains, often as high as 24.6 grains. THAT wasn't going to work! I resorted to dumping a small portion of the powder from the case back into the powder bin until the weight was right.
After putting the double stack kit on, I decided to go with a combination of .88 and .66 disk on top, totaling 1.54 cc's. After doing this, I got weights between 23.6 and 24.0 grains, but never more than 24.0 grains. The difference in weights was DIRECTLY related to whether or not I ran the turret around or just ran it like a single stage press, charging the case then weighing it, over and over. If I ran it as a single stage press, I'd get the lower powder weights. If I ran it with the indexing bar in (so to speak), I'd get consistent weights of 24.0 grains. I believe the reason for this is because as the turret spins around, it shakes up the powder bin, causing more powder to "shake down" into the disk holes. To me, that HAS to be the difference.
I got to a stopping point reloading (had to pick the wife up from work), but when I start back up, I'm going to test again repeatedly, weighing each individual charge again. If I don't see any charges OVER 24.0 grains after loading another 50 rounds, I'm going to feel more comfortable that I won't overcharge any cases with this double disk setup. If some cases "only" have 23.6 grains, I can live with that.
This W296/H110 is like freakin' SAND!
Thanks for any and all feedback!
Warner