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This is the .305 diameter steel neck sizing bushing from Redding, part number 73305. If you're running a Redding bushing-style neck sizing die and you want to fine-tune exactly how much grip your case necks have on the bullet, this is the piece that lets you do it. Swap bushings instead of fighting an over-worked case neck, and you'll get more consistent tension from one round to the next.
Neck tension is one of those details that separates plinking loads from the stuff that prints tight groups, and a bushing die is how you take control of it. Rather than squeezing the neck down too far and then opening it back up with an expander, the bushing sizes the neck just the right amount in one pass. That means less working of the brass, which translates to longer case life and better concentricity. These bushings are made from heat-treated steel with the sizing diameter hand-polished to a surface hardness of Rc 60-62, so they slide over the neck with minimal effort and hold up over a lot of loading sessions.
Sizing bushings are sold in .001 increments across the full range, and the last three digits of the part number tell you the diameter. This one is .305. To figure out what you need, measure the outside diameter of a loaded case neck with a precision micrometer, then subtract about .001 to .002 to allow for brass springback and bullet tension. If you're loading moly-coated bullets, you may want to go a touch tighter. Every bushing is clearly marked with its size, so there's no guessing once you've got a few in the drawer.
Redding neck sizing bushings share the same external dimensions, 1/2 inch outside diameter by 3/8 inch long, and they freely interchange across all Redding bushing-style neck sizing dies, including the Type S and Competition die setups. They're self-centering inside the die, so you get even sizing all the way around the neck. Made in the USA, this is a small part that makes a real difference once you start chasing tighter groups.
It fits all Redding bushing-style neck sizing dies and interchanges freely between them. That includes the Type S and Competition neck die setups. All the steel and titanium nitride bushings share the same 1/2 inch O.D. by 3/8 inch long dimensions, so they swap in and out easily.
Measure the outside diameter of a loaded case neck with a precision micrometer, then subtract about .001 to .002 to account for brass springback and bullet tension. That number is your bushing size. If you're loading moly-coated bullets, you may want to drop down another thousandth or two for a slightly tighter neck.
A bushing sizes the neck to exactly the diameter you choose in a single pass, so you're not over-sizing and then re-expanding the neck. That reduces how much you work the brass, which helps case life and improves neck concentricity. For precision handloaders chasing tight groups, controlling neck tension this way is a big deal.
Both are heat-treated steel with the sizing diameter hand-polished to Rc 60-62 hardness. The titanium nitride versions add a surface coating that further increases hardness and cuts sizing friction. This .305 (73305) is the steel version, which works well for most loading without extra case lube inside the neck.
| UPC | 611760733055 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 73305 |
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