Greetings DavidM,
Yes, the SAAMI specs are rather "generous". CIP drawings also add more variety into the ammunition and barrel/chamber specs.
Fortunately, one can buy a large quantity of brass from the same manufacturer.
I like Lapua as it seems very consistent over the years.
I have the resources to modify sizing dies to meet my loading needs. Lee Precision will make dies for those who do not have a Machine Shop at their disposal.
Now consider the variation in barrel diameters...
I have measured factory barrels that vary from 0.308" to 0.315" groove diameter.
This is one reason most commercial ammunition does not perform well as compared to carefully hand crafted reloads.
Cheers,
Dave
Manurhin 0.32 barrel
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