Here is a quick video on the Redding Type S Full Length Bushing Die. Bumping the shoulder and controlling neck tension is key to precision reloads.
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The Redding S Die comes with a sizer button installed. If you select the right sized bushing, you can set the neck diameter and remove the button. This will allow you to set your neck tension to the rifle and projectile you are using. It also allows for customization of neck tension - maybe more is better may less is more - that's for you to find out.
The easiest way to determine the proper diameter bushing is to measure the neck diameter of several loaded or dummy cartridges with an accurate micrometer. (These dummy cartridges can be loaded with your old set of dies or a borrowed set.) Then, simply subtract 0.001" from the cartridge that had the smallest average measurement. This will allow for a slight amount of spring back and create a proper press fit for the bullet. Here is a quick reference for bushing ranges:
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