So is this a fair conclusion from all the answers ?
Ideally to get the safest, very best performance & accuracy I would, use only one make of brass preferably the same batch, but I may use different makes of brass as long as I do not overcharge the case to exceed maximum pressure. So as I do not know how any of my cases will perform relative to pressure and one may ultimately be better than another, to work out which one/s is the best I'm thinking. As long as I say
1) Use the Hodgdon charge information and from this
2) Decide on my preferred bullet weight (Gr) and powder.
3) Resize several of each different makes of brass, but trim all to the same length, say 0.010" below max case length.
4) using the Hodgdon, starting load powder grains weights ( or something very near the starting charge) load all the cartridges.
5) Seat all bullets to the C.O.L stated in the Hodgdon info.
6) Fire bullets, noting which is which. See if there is a noticeable difference in grouping.
7) Check used cases for signs of excessive pressure. Discard that make if so.
8) If one make stands out then proceed with this make maybe increasing load weight slightly to see if group improves or carry on with different makes,
As long as I stay away from stated maximum load. Once I get a grouping I am satisfied with and the fired case shows no signs of stress. Either stop at that (may be using more than 1 make or case but also may have discounted a certain make/s.)
9) Reload only these cases there after i.e the ones which give me the best consistency.
Some of the above may sound simplistic or stupid but as I have only fired factory loads and do not know how accurate development, home loads are, I'm just thinking I may get acceptable accuracy / grouping from one or more.
What I will say is shooting foxes at night off sticks, whilst I have been walking around is I'm sure the biggest reason for my inaccuracy. But I do ultimately want the load to be, firstly safe, but the best I can get it at a reasonable price, with the added satisfaction that I constructed that load.
Thanks