It must be something in the water
...I ordered a 9.3 twist from Rock Creek a few weeks back. I'd done two others prior and got rid of the AR. The Savage barrel is still around here somewhere..
Since my last effort I've acquired a 458 throating reamer and have an idea about some Lehigh brass solids that weigh 528 gr and have a calculated BC of .828
Best wishes for both your builds...be sure and post progress reports.