AR-MPR: Phase II Redding Equipment Overview

For Phase II of the AR-MPR we will be focused on precision handloading techniques and load development. For this phase of the project, I decided to showcase some of the popular Redding Reloading products that have an outstanding quality reputation. Here, we’ll talk briefly about each of these products.

The Big Boss

At the heart of the loading process is the reloading press. The Redding Big Boss II is a solid precision American-made product that is ideally suited for this project. It is constructed of cast iron (base), and steel (ram, linkage, lever arm, etc). It also features a “thru-the-ram” spent primer collection system which utilizes a tube to either collect the spent primers, or directs them into a trash can or other container.


The Redding Big Boss II single stage reloading press - Image Copyright 2011 Ultimate Reloader


For this project, we’re going to leverage two important add-ons: the first is the Redding Slide-Bar priming system. I’ve used the slide-bar system on the Redding T-7 turret press, and really like the way it works. The second add-on we’re going to use is the Hornady Lock-N-Load bushing conversion kit. This will allow us to quickly swap out dies, and also enables some “free-float” action for the die, which can help with alignment for seating and sizing.

The Competition Seating Die

If precision is important, consistent bullet seating depth and bullet runout are critical. One way to help with consistency of seating depth and concentricity is to use a bullet seating die that employs a sliding collar which keeps the case and bullet in perfect alignment while the ram is raised to its topmost position. The Redding Competition Seating Die is a device that employs this type of mechanical action. Furthermore, it also provides a micrometer for seating depth adjustment. This die is machined to tight tolerances and has a very high quality look and feel (white lettering is perfect, black bluing has good finish).


The Redding Competition Seater Die - Image Copyright 2011 Ultimate Reloader


When you examine the components that make up this die assembly, you can easily see how it works:


The Redding Competition Seating Die Assembly - Image Copyright 2011 Ultimate Reloader


At top here, we have the lock ring and die body. At bottom, we have (from left to right) the sliding internal body, the seating plug, the compression spring, and the micrometer adjustment screw.

As the ram of the press is raised, the case comes into contact with the inner body. The bullet contacts the seating plug, and the entire assembly moves upwards- compressing the spring. Near the top of the stroke, the seating plug bottoms out against the micrometer adjustment screw, and for the remaining upward motion the bullet is seated. At the top of the stroke, the ram stops, and the bullet seating is finished. With its sliding collar, this die works well even on progressive presses where the shell plate rotates (bullet is pre-aligned as the bullet and case enters the bullet seating die).

The Measure

Since we’ll be loading single-stage-style in Phase II, we’re going to need a high-quality off-press bench mounted powder measure. The Redding 3-BR is an extremely high quality unit that has all of the features that we’ll need to throw consistent charges for the .223 Remington ammunition that we’ll be loading.


The Redding 3-BR Benchrest powder measure - Image Copyright 2011 Ultimate Reloader


Here’s a few things that are notable about this powder measure:

  1. Solid cast-iron construction
  2. Powder baffle is included
  3. Zero backlash micrometer metering inserts make load adjustment quick and repeatable
  4. See-thru drop tube allows you to see powder charge (and know when drop is complete)
  5. Quick release nut allows measure to be dumped quickly

For some of the test loads that I’ve put together, I’ve noted that powder drops (with Varget) vary by +/- about .1 grain! That’s outstanding metering consistency! That doesn’t always happen with every powder (especially large stick powders) – but in this case, that will make life easier.

With Redding equipment you know you’re getting top-quality competition proven gear that’s made from USA steel in the USA. Not everyone can say that!

Coming up, we’ll be seeing how this equipment is used in detail, so stay tuned!



2 thoughts on “AR-MPR: Phase II Redding Equipment Overview”

  1. Gavin,

    You reviewed a Hornady GS-350 electronic powder scale in an earlier posting and I was curious if you find its accuracy sufficient to work up your loads? Are you using this scale or another for this project?

    I have the Hornady GS-1500 and finds its accuracy suspect. I find that my loads will vary +/- .3 grains when measuring the same sample. It does not sound like much, but my 40 SW loads have ranges in some cases of .5 grains total and +/- .3 grains is a big variation.

    In other web postings, its seems the consensus is that to get good repeatable and accurate measurements, I need to spend around $300+ to get a good electronic scale. What are your thoughts / findings?

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