I did leave out the powder part...
I've only played with the Palma 95 and Obermyer chambers. The Omermeyer is great with the 175 Sierras, but the newer sleek 155s don't seat deep in the case at all when near the lands. The new generation 155s do great with the Palma 95 chamber that was designed for the old sierra 155 "copper snails", but still have a longer C.O.A.L. than the mag length the OP requires.
The newer Palma reamer designs have throats closer to the Obermyer and M118 in length.
If I can get a 155 to 3000fps I am happy to 1000.
