AR-MPR: Phase II Kick-Off

Now that we’ve build and function checked the AR-MPR rifle (See Brownells Videos for Complete Details), it’s time to move from Phase I (Build) to Phase II – Precision Loading and Rifle Accurizing/Tuning. This rifle has already proven that it’s capable of meeting the original accuracy goal of .5 – .75 MOA (See Range Report #1 Post), so let’s see just how good we can get this rifle to shoot!

The Redding Big Boss II Single-Stage Reloading Press with Slide Bar Priming System - Image Copyright 2011 Ultimate Reloader

As a starting point, I wanted to give an overview of some of the loading procedures and equipment that I plan to show/use during this phase of the AR-MPR project. This phase will involve practices and techniques that will demonstrate how precision loading and shooting and lead to smaller group sizes. We’ll discover how various factors and components can affect accuracy so that we know what we can an can’t get away with when we move on to phase III (ammo mass production).

Here are some of the reloading procedures we’ll cover:

  • Component selection and load development
  • Brass prep
  • Single stage loading using off-press powder measure
  • Precision measurements (bullet run-out, Chronograph readings, COL variation, etc)
  • Load refinement

And here are some of the tools that we’ll use:

  • Redding Big Boss II with Slide Bar priming system and Hornady Lock-N-Load bushing conversion kit
  • Redding 3-BR benchrest powder measure
  • Redding competition bullet seating die
  • Redding Instant Indicator
  • Hornady concentricity tool
  • Hornady Lock-N-Load headspace gage kit and bullet comparator kit
  • Hornady powder dispenser
  • Case trimming and prep setups (Redding 2400, Hornady Case Prep Center, etc)

I’ve really been looking forward to this phase of the project because I am passionate about precision, quality, and generally enjoy “dialing things in”. I’ve also been looking forward to trying out new equipment, and sharing my experiences with you all. If you are needing precision out of your AR-15, I think you’ll find this phase to be both interesting and informative. If you’re a shooting or handloading expert (or have experiences in these topics) I’d love to hear from you and benefit from your knowledge!

Please do let me know if there’s anything I’m missing here that you would like to see, or questions that you have. As always, feel free to leave comments.

Thanks,
Gavin

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7 thoughts on “AR-MPR: Phase II Kick-Off”

  1. Over the past 2 years, I have watched (and learned greatly from) all your videos as I dived into reloading. The Hornady LNL AP videos have been especially helpful, and I have viewed many videos more than once!
    Your AR-15 build has been very instructive, and it was especially rewarding to witness your success on the 1st range trip.
    That said, what are the chances that your sponsors at Brownells and Nikon might put together a “ULTIMATE RELOADER AR-15 MPR KIT” for your followers? If it included a receiver, the kit could be shipped to a FFL and Brownells could include the AR-specific tools. I’m sure it would still be pricey, but it might be doable.
    Just a thought and keep those videos coming.
    Ken

    1. I kind of like the sound of that, and would definitely be interested in purchasing something along those lines if the sponsors would be interested in putting something together. I would say avoid putting the receiver in there, since it is a fairly obtainable component, and would simplify sales.

    2. Ken- that sounds like a really good idea! I’ll discuss with my sponsors! I think doing a kit minus the lower receiver would be a good option so that people could buy such a kit without having to worry about FFL.

      Thanks,
      Gavin

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