Thread: Pressure Signs in the 6.5x47

Just wrapping this thread up from my perspective. I did a bit of testing on my own 6.5x47 - Barnard action so not necessarily a good choice for showing pressure signs, but it is what it is. I pushed the peak pressure up to what I estimate was 68kPSI while measuring case head expansion just above the extraction groove. Wasn't willing to go any further. Multiple firings, multiple cases, and less than or equal to 0.0002" expansion averaged. That would give loose pockets on multiple firings but not immediately, not for a while. My reticence to stuff the cases any further and get beyond 70kPSI and/or a thou of expansion per firing will be understood when I say that this was already a 44gr compressed load giving 3000 ft/sec with 140gr VLDs from a 30" barrel from a slow batch of 2209. Plus I couldn't find any accuracy up above 2900 ft/sec so no real point in staying up there.