I made it to the range yesterday with some .293 grainers out of my custom mold loaded over H110, and WC680 in cut down .284 brass. If things slow down at work this afternoon I'll try and get the data posted. The short version is that the H110 loadings show some promise at around 1900 fps. I managed to keep 5 out of ten in .9", unfortunately the second mag opened the group up over 3". Part of it was definately me, part of it may be lube build up. In either case, 33 grains of H110 gave me an ES in the 20s and single digit SDs. That's something I can work with.
The WC680 gave groups of 3" at around 1900 fps as well, but with ES values again around 100 and SDs in the fourties. Also, plenty of unburned powder grains in the barrel after each shot. Higher charges definately blew the groups open, and ES values went up. It's a usable powder, but not my first choice as it just doesn't burn dependably. My early conclusion so far is that H110 is preferable over either LilGun, or 1680 for cast boolits in this cartridge, although I do need to go back and re-try LilGun using the cut down .284 brass as the larger primer may be a real factor here. My lyman "M" die came in and it's expander is a full .001 smaller than the Hornday expander which helped a lot, and allowed me to back off the body crimp somewhat which should help brass life. Accuracy work ups will be from 32.5 to 33.5 grains. I've also ordered a .453 sizer die, which will lead to another round of trials with the more promising loads.
At the end of 60 rounds, all gas checked, the barrel was clean, bright and shiny, a clean dry patch produced some carbon, but no lead. I'm going to leave the bolt and gas system uncleaned for a while to see if the cast boolit rountine is gonna clog up the works or not. My brake was well coated with lube at the end of the session and I'm considering cuting the lube down to one groove for a trial as there's definately plenty on these to make it to the end of the 16' barrel.
BD