Berger 168 VLD .308 win loads

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Bottleneck cases having thrown charges with stick powder having a few tenths grain spread......

* hold virtually all the benchrest records through 300 yards.

* is standard procedure at Sierra and Hornady loading unprepped cases to test their match bullets getting no worse than 1/2 MOA 10-shot groups at 200 yards.

* has been loaded in new uprepped cases by rifle teams producing 1/2 to 2/3 MOA accuracy at 600 yards.

It's not important that your scale weigh exact with a lab standard check weight. It only has to be repeatable within 1/10 grain and average no more than 1 grain off from a check weighs. There's a greater spread in heat and energy output across all lots of a given powder's charge weights than a 2/10 grain spread in charge weight typically produces. And there's typically a 1 to 2 grain spread of charge weights that produce excellent accuracy through 300 yards. And the same load shoots equally well across most barrels.

This data is based on several dozen groups fired with a given load. If a load is tested with one few-shot group, then there'll be 100 different loads for the same set of components for 100 people developing a load in the same rifle.

If each and every barrel needs its own unique recipie, why does good commercial match ammo shoot so well in most barrels?
 
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