Acceptable brass weight and volume

[Ned Ludd]

Ned, your graph shows the heavier weight cases seems to percentage wise have less case volume so when load batching would starting with the heaviest case weight and loading with the heaviest bullet working from heaviest weight to lightest for both cases and bullets that are closely batched together help even out the es for long range.

In the past I have used that information to sort cases a few different ways. One is from heaviest to lightest correlated with bullet weight as you suggested. Over time, I have found it simpler and easier to sort a single Lot # of brass into 3 or 4 distinct weight groups, then load up suficient rounds for an individual relay (or an entire match) from the same weight group. If I don't have sufficient cases within a single weight group for an entire match, I might use the heaviest sub-group for Relay 1, and lighter sub-groups for later Relays; the idea being that as temp increases, you might be offsetting the effect on velocity slightly by uses case with greater internal volume later in the day. It is relatively easy and not too time-consuming. Of course, that might not be sufficient for the precision requirements of a discipline such as BR, but it appears to suffice for my needs in F-TR. Frankly, I rather doubt that the extent to which I go to prepare brass is a limiting factor (as opposed to my shooting skills ). If I really felt like I needed more consistent case volume, I would probably bite the bullet and sort cases using water weight, but that would be a pretty painful method for the number of cases I go through.