05-24-2020, 01:34 AM
With a setback of 0.015 (sorry but with a used pistol case I do not believe you have 4 significant digits in your measurements), vice the 0.003-0.004 you ought to be doing, you are over-working the brass bigtime. That conclusion one can reach.
But if you want precise specs/ measurements, you must use precise instruments, and a pistol case is not it. Might even want to look at your caliper, I would if I want to get that fine of a resolution. Even a slight but unnoticeable cant of that 10mm on your Grendel casing can cause some unknown few thousandths of a delta in your measure, one you won't know about and cannot eliminate or guarantee when it will showo an when it won't.
The other thing using the case comparator (with the 0.350 bushing) is you have numbers that others can relate to. And numbers you can relate to the Saami drawing. With the 10mm case you have neither of these.
But if you want precise specs/ measurements, you must use precise instruments, and a pistol case is not it. Might even want to look at your caliper, I would if I want to get that fine of a resolution. Even a slight but unnoticeable cant of that 10mm on your Grendel casing can cause some unknown few thousandths of a delta in your measure, one you won't know about and cannot eliminate or guarantee when it will showo an when it won't.
The other thing using the case comparator (with the 0.350 bushing) is you have numbers that others can relate to. And numbers you can relate to the Saami drawing. With the 10mm case you have neither of these.
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