farmerbuck, I am a newbie venturing into the world of rifle cartridge reloading, and I know that not all bench rest accuracy processes will be applicable for my shooting purposes, but I wanted to have that option, if I wanted to pursue it (As I found out, I am glad I did).
The sorting station/reloading bench came out of frustration. After I got my batch of mixed head stamp once-fired .308 cases (which included a lot of LC brass), I thought it would be easy to separate the batch into lighter commercial and heavier (less internal case volume) military cases. So I got out two coffee cans and my scale then proceeded to weigh the cases. I was expecting a fairly clear separation in weight, but I was not ready for what I found next. The weights were all over the place, even for LC brass (some LC brass dipped way below 175 gr!). I ended up adding several more coffee cans and ended up with these:
- Cases that weighed less than 168 gr
- Cases that weighed between 168-175 gr
- Cases that weighed 175 gr
- Cases that weighed 175-179 gr
- Cases that weighed more than 179 gr
Keep in mind that these are once-fired brass (and I added the "once-fired" to my previous post and reflected it in the process steps). My intent was to simply separate the commercial cases from heavier walled military cases with less internal volume. Well, I am still doing my research as to why such a wide variations in military spec cases to dip way below 175 gr but that's another story and for now, I separated out the really low weight military cases.
I am going to be checking the internal volumes of each weight group next to verify their consistency and further segregate (I have about 1000 cases). Once I have done that, then I plan on resizing/trim and weigh to sort by 1 gr groups into the bins on the sorting table.
I have done some initial test loading with about 100 cases that weighed right at 175 gr before trimming with H4895/Varget and got just over 1" shot groups. These cases were marked and be kept as a group.
As I venture out to weight groups that vary more (say 168-175 gr group), I will utilize the sorting table bins more as I would group them in 1 gr increments (168, 169, 170, 171, 172, 173, 174, 175) and use up all 8 bins in each row. As I process the cases, I simply need to move each bin up the rows until I get ready to load them. When I pull a bin from the top row, I know that the cases in the bin are from the same weight group pre-trim, with same post trim weight.
Once I compare shot groups from various weight groups, I hope to establish a trend that will allow me to be less detailed in my weight separation, but I am new to this and having fun with the process (I know, I will probably get tired of it soon enough, but at least I will be able to say - Yup, been there and done that).
I really was hoping that my two coffee can idea would work out ...