I just started to work up some loads for a newly rebarreled 22-250, and I have been using virgin brass to find the approximate load that I will then start to zero in on. So far ,I have shot a .410 5 shot group with virgin brass, Sierra 52 HPBT, and Varget.
I will now concentrate on seating lengths and will use some neck sized brass to see if it helps the groups.
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