TPM reloading dies are machined on high-performance CNC lathes.
The bodies are made of steel treated with Chrome Molybdenum to guarantee very high hardness. To maintain excellent concentricity, the dies are not heat treated after machining.
Neck dies allow you to reform the neck of the case after shooting, using a bushing, and also allow you to defuse the case.
The bushing has a big advantage: it allows you to adjust the clamping force of the neck of the case to the ball.
This adjustment is used to manage the regularity of the speed and accuracy of the cartridge.
To calculate the internal diameter of the bushing simply measure the diameter of the collar of a mounted cartridge and subtract 0.003″ from this measurement. This value can then be corrected by carrying out firing tests with bushings from -0.002″ to -0.005″.
Neck dies feature an unconstrained floating chamber to guide the case as far as possible towards the bushing.
There is also a defuse needle.
As an option it is possible to fit an internal recalibration olive in place of the defusing needle retaining nut.
Attention! Bushing not included .
Small reminder on choosing your bushing.
Measures the diameter of the neck of a cartridge complete with mounted ball.
Subtract 0.002 to 0.003 from this inch value and you will get the value of the bushing to use.
For example, neck diameter with mounted bullet 8.53 mm (divided by 25.4 to get it in inches), or 0.336.
At this value, we remove 0.003
0.336 – 0.003 = 0.333. The bushing to use is 0.333.
