I never made it to the range today because of the weather and brass delemas. I weighed cases from two boxes of once fired factory brass. The results are less that exciting. The cases weighed from 275.1gr to 279.4gr. The boxes were not from the same lot but weighed in the same range so I decided to weigh them all full of water and see if this weight corralated with its case weight. Cases with water weighed from 391.6gr to 394.9gr and did indeed corralate to within a tenth grain or two of the expected weight accross the whole board. Here's my delema. I only have this brass to load so far and I cant even get twenty cases within 1gr and worse it's almost a full two grain spread. Question is, if I use these cases and load up one round each in .2gr increments from starting load to max load to see where the sweet spot is, do I start with the highest case volume and the lowest charge wt together and end up with the lowest case volume and highest charge wt together thus increasing pressure a little faster than if I combined them in the opposite way that would in effect almost cancel each other out? I realize that some may feel this is splitting hairs, but it will have an effect and skew the results if not accounted for especially while looking for consistant grouping over a range like this. I usually develope a load like this with case and bullet weights within .5grs and just note the weight range used for later adjustments if anything weighs different and accuracy isn't there anymore. At this point a couple hundred rounds of brass would be the answer but I don't have any yet. To those that weigh your brass for the ultra, what are you experiences and practices?