Second time out with the 6.5CM that was cobbled together from parts. The first time resulted in 2 shots touching and the other 3 making a 6" group. This time was similar with a new kink - separated cases
The cases separated about 3/8"-1/2" above the rim. I suspected excessive headspace and stopped shooting that rifle. Once home I checked: the NO GO gauge allows the bolt to close only about an 1/8". The bolt closes on a GO gauge. Either I have bad gauges, a short chambered barrel that allows the barrel to seem to be in spec, but leaves the case unsupported, or ... ???
I have a depth mic and can measure how much of the GO gauge sticks out of the removed barrel, but I have nothing to compare it to.
I REALLY miss my 260!