Wayne, I've only shot mine BSed so, I can't help at all for fixed.
I've only shot two powders in mine, 4227 and Win 296.
My bullet is a modified 311413 that casts .313 on the bands and I took the GC of and made a .316 base band, .100 long. It's 1.050 long and weights 173 gr in 24/1 alloy.
The base band diameter and the BSing depth will be important in these rifles as, they have long throats.
IMR 4227, F150 primers, all groups at 100 yards. Darr lube, Temp 40 deg.
11.0 gr, 1165 fps, 15.5 SD, 47 ES, (to slow, bullets tipped) 1.75 five shot group.
12.0 gr, 1280 fps, 20.8 SD, 48 ES, .94 group (4 in .40)
13.0 gr, 1356 fps, 18.9 SD, 57 ES, .62 group
If you use H110 or Win 296 reduce the above charges by .5 gr and you will get similar results.
Frank
