I wouldnt even mess with turning case necks, they should all be fine. The maximum differnece I allow in my weights are .2 grains either .1 high or .1 low of a median weight that keeps showing up. I usually end up with at least 3 piles of brass. One large pile of one weight and a slightly smaller pile of another different weight that measures out well and a third pile that doesn't match up with anything and either gets given to a friend or tossed.