These dies are terrific!
They allow you to adjust the diameter of your case necks far better than using ordinary resizing dies. You'll also be able to get rid of the expander
button and that will greatly reduce the amount of un-necessary resizing of the case neck. Unlike other resizing dies, these bushing dies can
ensure that you'll always get the correct bullet tension by controlling the exact amount of neck resizing. Ordinary resizing dies can only work properly
with cases that are at one particular neck thickness.
If you ever measure the neck diameter on several identical handloads (using different brands of brass.) You
will find that different brands of brass, or even different lots of brass, can vary in neck thickness quite a bit. That's a great reason for using
the Redding "S" Type resizing dies. They allow you to control the exact bullet tension by using the correct size neck bushing. This is an
important factor for getting your best accuracy, and it allows you to try different brands of brass and still have the correct tension
on your bullets.
To determine the correct bushing size to use, just measure the neck OD of a loaded round and deduct .003"
(that's usually the best bushing size to use) and it's also a good idea to purchase the next size smaller bushing. These dies
eliminate the need for using an expander button, and that alone should improve the concentricity of your handloads. The case necks will also
provide a more elastic grip, because they will not be as work hardened.
