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Friends have stated normal 'after sizing and expanding' diameters usually are .005" to .002" smaller than bullet diameter. That quite a range, but makes a .361" ID normal in that context. .005" undersized is good in magnum handgun ammo and staight case ctgs. like .458's, but seems unecessarily snug for a bottlenecked 'normal' round. Tight does help in promoting good powder ignition and even burning (which is why it's good in straight cases). The excess sizing is why I stopped buying Green Box dies long ago. .653" ID is unnecessarily small - but very common for mass produced, 'cheap' dies, but allows the die making company to use reamers long past their useful life, thus reducing costs and increasing pofits. Even though they might not have been 'cheap' per se`, they are standard production dies in design and not true custom dies (few really are). |