Brass sorting and Powder lots

[FOTIS]

OK Guys 2 part question.

Brass sorting:

If so have you conducted any test to see if that really makes a difference? Just to be clear I am not referring to Benchrest shooting. Just hunting accuracy. I mean if it can be the difference between 1/2" group and 1" group it does make a difference to me but I find it very tedious. I am talking about big magnum hunting cartridges, not 222, 223 etc.
Some of my brass (338-378, 378, 416, all WBY) can have a difference of 3-4 grains at those sizes.
If I sorted with a difference of 1 to 2 grains I would wind up of 10 lots of 8-10 brass each. Would it be worth it?



Powder lots:

Has anybody worked up an awesome load and then run out of that powder? Then you go and buy another pound, but it's a different Lot number. Have you seen any huge differences between the initial load and the load with a new powder lot? How do you deal with the situation?
My question is directed at RL 26. I am opening up a new "jug" and I have 4 magnum rifles that use that powder.

 

[RL338]

With the 378 based case I don’t worry about a few grain spread. I do focus on the H2O capacity of the case. I do keep all my brass in separated ammo boxes by lots.
I do know that my Norma stamped brass is heavier than the Wby stamped. Another thing with Wby brass is the age of it. The old brass is by far lighter , it can be tell by the flat bottom. You don’t want to mix any of those in.
Old

New

With Alliant powders RL-17 is the best for lot to lot I came across. It never needed to be adjusted.
RL-26 has been good for lot to lot with a slight variant in velocity.

 

[FOTIS]

Thank you Rick. It is so frustrating!