I base my own opinion on observation of my most meticulous OCD precision rifle buddy: he fiddles with every possible variable including the direction the head stamp is turned both in loading and in the chamber; case weight empty, check; case water volume, check; matches boolit weights and specs determined by individual examination, check; angle of the moon in relation to his loading bench.....probably....

He does produce some extremely tight groups in small bore out to several hundred yards.

He tried to apply the same meticulous fiddling to his pistol rounds, notably the 45 ACP and the 38 special. Was unable to produce repeatable verifiable predictable results in accuracy variation on this last handgun group.

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