One-step bushing reduction/bump operation sets the shoulder back to keep your case neck in better alignment with the case's center line. Prevents overworking of case necks, as well as controls the amount of neck tension for your bullet seating operation.
- Versatility allows you to custom size your cases to your specifications.
- You can adjust the bushing to allow partial case neck sizing, allowing the un-sized section to better align the cartridge in the rifle chamber. This action places the bullet close to the lands of the rifling with equal pressure at top and bottom.
- Bushings need to be purchased separately.
- This die comes packaged in a cardboard box.
Neck wall thickness varies brass manufacturer to brass manufacturer. Depending on your application, you will probably need a selection of bushings if you are loading different brands of brass. One way to measure bushing size is to use a ball micrometer and measure several cartridge case neck walls, and then average the measurements. To that average you double it and then add the bullet caliber. Another way to find the correct bushing size is to measure several loaded rounds, and then you average the readings. The calculated number arrived at is used to determine your neck bushing size. Common wisdom suggests that you will need a certain amount of neck tension for each rifle.
For single loading in a bolt gun, optimum neck tension would be 0.001” so you will subtract that from your average measurement.
For loading from bolt gun from the magazine, optimum neck tension would be 0.002”.
For loading from auto-loading gun from the magazine, optimum neck tension would be 0.003”.
An example of the 308 Winchester measurement came to 0.338”. So, the bushings would be 0.337” / 0.336” / 0.335”.
