There is no such thing as an exemplar sample of the ammunition you may have used.
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And you CANT call the ammo company up,,, because each lot date is loaded differently from every other one. They can and DO use a different powder in each lot, and adjust the loading with each cargo container of powder that comes in.
As noted previously, the ammo companies keep exemplars of ALL ammo lots, they also keep extremely detailed records including the machine that produced that lot, the brand, type and lot number of primer; brand, type and lot number of powder and amount used; bullet make, type and weight-lot number if available; date/time of production and possibly the name of the machine operator.
They do this mostly for liability reasons in case of a ka-boom, but they do make the records available for other reasons. In my state, such records have figured in several trials. One where the state crime lab used the wrong lot of ammunition for comparison testing.
The records of Fedingtonchester would be admissible as they are from a third, disinterested and independent party. Your records wouldn't be those of a disinterested party.
Finally, if the case alluded to in the post by BB57 was the Bias case, Bias lost. His records weren't admitted. IIRC, neither were test results from an independent lab on left over ammo.
My competition, practice and most training is done with factory duplication hand loads. I carry factory. It's a lot cheaper than paying an attorney to argue about the source/choice of your ammo.
And yes, let's PLEASE just leave this in the "we agree to disagree" bin and not waste more bandwidth on it. There was once a website where noted experts in the field held forth on this issue. Alas, it is no more. The collected wisdom of those gents was essentially what I posted as my practice.
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