Raptor
2nd batch
Measured 12.5 to 14.5 with a Sinclair neck mic on typical cases.
That is -one side measures thin,12.5), one side measures thicker,14.5). Some cases measure little variance, but at different thicknesses. Piles form. Like a perfect 13case goes in one pile, a perfect 12case goes in another. A .5thou variance pile, a 1thou variance pile, etc. Alot of little piles!
In this case, the max variance may correlate to 1gr change in H20 cap amoung them,per quickDesign/RCBS Load). Weight variance also has to be correlated and actual volume cannot be measured until fully formed. Since 1gr H20 variance is alot for a longe range cartridge, I choose -up front- those consistant, that correlate, and seemingly in the majority. Toss the rest. After firing I measure the H20 cap on each case, normally finding a few here & there that still leave the pack. Tossed.
It seems alot to figure out, but I setup a spreadsheet and have gotten pretty good at choosing brass for the long haul. Out of 500 Lapuas in 6br, I recently choose the best 300. After firing and H20 checks, I had under .2gr variance in all but 2. This was very easy with Lapua though -huge difference.
By the same standards, I'd be lucky to end up with 20 out of 300 6xc. So I stopped, and talked to Dave. He feels that it won't be an issue. But I haven't been motivated to proceed other than purchasing batch3 brass, and deciding from there. I might actually have the rifle then and try some. But a new barrel is easier to sell than a used one.
There is another factor -bananas. I'll be shooting a T2K with a standard chamber, and reloading with the standard redding 6xc dies. I'll clean up the necks, but with this body form, some body sizing will likely be needed with each reload. In the past I have seen runout increase to a point that cases were bad in my view, due to brass thickness variance and sizing -creating banana cases. This is part of what got me doing all this culling years ago. Eliminating as many basic factors right up front, has been the only way to ensure first shot, cold barrel hits on distant chucks.
