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Sinclair stainless steel neck turning mandrels for 17 through 50 caliber cartridges are turned from high grade stainless steel on precision turning centers. Turning mandrels are sized .002" under bullet diameter. The shape and surface of all of our mandrels is the result of years of experimenting by many expert handloaders. Our Carbide turning mandrels are precision ground from solid carbide stock, which yields even closer tolerances. All Carbide mandrels are ground to .002" under bullet diameter. Adjustments on our NT-4000 turning tool will be more consistent with carbide mandrels due to the tighter tolerances of the mandrels. Large caliber (35 to 50 caliber) mandrels fit only the Large Caliber Expander Body and the NT-5000 Turning Tool.


Sinclair, Issue:5B, Page:019
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Caliber: 17 Caliber

Diameter (in): 0.170

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Caliber: 20 Caliber

Diameter (in): 0.202

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Caliber: 25 Caliber

Diameter (in): 0.255

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Caliber: 264 Caliber, 6.5mm

Diameter (in): 0.262

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Caliber: 270 Caliber, 6.8mm

Diameter (in): 0.275

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Caliber: 30 Caliber

Diameter (in): 0.306

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Caliber: 338 Caliber

Diameter (in): 0.336

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Caliber: 22 Caliber

Diameter (in): 0.222

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Caliber: 243 Caliber, 6mm

Diameter (in): 0.241

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Caliber: 284 Caliber, 7mm

Diameter (in): 0.282