There are no hybrid cases in 308 and 6.5 Creedmoor...you have to find 277 Fury bi metal cases and form them. 308 is easy, just mandrel the 277 and run through the normal 308 sizing die. The 6.5 Creedmoor I use 308 FL die to move the shoulder then 6.5 Creedmoor FL die trim to length, and neck turned all on lathe. I haven't annealed anything so far. I used 3 powders in the 308 experiment with different bullet weights from 155 gr 3182 fps, too fast on powder choice ,168 gr 3255 fps, 200 gr 2951 fps, 225 gr eldm 2719 fps... and one powder in the Creedmoor with 150 gr SMK only bullet tried, at 3056 fps. I dropped these top velocity loads 50 fps and have been running the 308 200 gr SMK .715 Bac at 2900 fps and the 6 5 Creedmoor 150 SMK .713 BC at 3000 fps. With these cases. I do not give out powder or specific load data as this is a somewhat dangerous endeavor. Pressure signs are a little different with the SS heads...no marks at all on the case head, no blown primers, primers fairly round, primer pockets tight ss when I started after three firings....any action resistance on opening is a big pressure indicator with these, back off, your stressing the action. These cases are very strong. I have a new Bartlein barrel ordered for the 6.5 Creedmoor and will experiment with that rifle ... look for barrel wear, and check the action. So far it's all good...everything as it was on the go gauge of the 3 lug action which I will continue to use. Gonna fireform a bunch of 6.5 cases already made up with 140 gr. bullets. I do not recommend anyone doing this. I'm just looking at the possibilities with these new components, and would recommend that most would wait for the 277 Fury to fully develop and be available. I have a full machine shop and am retired machinist and build my own rifles....and this is a rather serious endeavor to answer questions I have.
