Redding .305" Heat-Treated Steel Neck Sizing Bushing - Precision Reloading Tool

Introducing the Redding .305" Heat-Treated Steel Neck Sizing Bushing, a precision reloading tool designed to elevate your ammunition reloading process. Crafted from heat-treated steel, this bushing is engineered for durability and consistent performance.

Key Features

• Heat-treated steel construction for longevity
• Hand-polished sizing diameters with a surface hardness of Rc 60-62 for reduced sizing effort
• Available in various sizes from .185_ to .368_ in .001_ increments

Choosing the Right Bushing Size

Ensuring the proper diameter bushing is crucial for achieving optimal ammunition performance. Here are methods to help you determine the right size:

Method 1: Cartridge Neck Diameter Measurement

The easiest way to find the correct bushing size is by measuring the neck diameter of several loaded or dummy cartridges using an accurate micrometer. Follow these steps:

1. Measure the neck diameter of multiple cartridges.
2. Identify the cartridge with the smallest average measurement.
3. Subtract 0.001_ from the smallest measurement to allow for slight spring back and ensure a proper press fit for the bullet.

Method 2: Neck Wall Thickness Measurement

Alternatively, you can determine bushing size by measuring the neck wall thickness of the cartridge cases with a ball-type or tubing micrometer. Follow these steps:

1. Measure the neck wall thickness of the cartridge cases.
2. Double this measurement and add the bullet diameter to calculate the neck diameter of a loaded cartridge.
3. Subtract 0.001_ from this figure to determine the bushing size.

Please note that the second method may be less desirable due to the cost and difficulty of consistently reading a ball micrometer compared to a conventional micrometer.

Method 3: New Cases and Caliper Measurement

If you're starting with new cases, you can determine the neck wall thickness by seating boat-tail bullets in a few cases and measuring their neck diameter. Generally, new cases have a small enough neck diameter to hold a bullet without sizing. As a last resort, you can measure the neck wall thickness of the cases with a caliper. Be aware that caliper measurements may require multiple attempts to achieve accuracy due to reduced measuring precision.

It's important to note that these methods assume that the cases being sized have a fairly uniform neck wall thickness or have undergone neck turning. If the neck wall thickness varies more than 0.002_, it may be necessary to use a slightly smaller bushing size than initially calculated and then use a size button in the die to determine the final inside neck diameter.

Elevate your ammunition reloading process with the precision and reliability of the Redding .305" Heat-Treated Steel Neck Sizing Bushing. Choose the right bushing size to achieve consistent and accurate ammunition for your shooting needs.