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Episode Info: Interview with Andy Huebschmann of Thureon Defense and Sunny Hill Enterprises. Andy explains the history of his companies. Sunny Hill manufactures a line of custom metal products for high end custom rifles.  Pete Grisel the originator of the Sunny Hill product line said of the companies products, “I wish I could have made them that well when I started out.”  Andy talks about the new products being added to the line. Andy also talks about the carbines offered by Thureon Defense.  The trigger parts, butt stock, and grip are all AR-15 parts.  The receiver is designed specifically to work with pistol cartridges. The latest version of the carbines utilized Glock style magazines.  Calibers offered in Thureon Defense carbines are 9mm, 357 Sig, 40 S&W, 10mm Auto, and 45 ACP. http://www.thureondefense.com http://www.sunny-hill.com Below is the Thureon Defense, Meltdown video as discussed in the interview with Andy. http://youtu.be/tpQ9ZJjId5A Headspace the Final Frontier 280 Ackley Improved The traditional method of Ackley Improved headspace is explained in simple terms.  Then we discuss the controversy over the chamber and ammunition dimensions for this cartridge.  The problem stems from multiple drawings which were generated using two different mathematical approaches. Fred performs a simple empirical test to determine the real world difference between the SAAMI or Nosler version of the cartridge and the “traditional” Ackley version, see photos.  If you’re chambering for either version of the cartridge, simply use the gauges that are made for your version.  This is the simplest and smartest way to be sure you have the correct headspace. Below is a link to a Youtube video that generically explains how AutoCad can locate and interference.   MasterCam has a similar feature.  This is the functionality that was used to change the drawings for the 280 Ackley Improved by the design engineer.  It would have made more sense to ask the reamer maker who works with these dimensions everyday to handle these decisions, not a piece of software. http://youtu.be/iDQVzMmS6Pk For more details on the 280 Ackley Improved controversy check out Fred’s blog where there is an ongoing discussion of this subject. Big News:   Miller Precision Arms introduced a new rifle on July 4th of 2012! MP-300 Guardian.  Is a 300 Winchester Magnum on a true AR Platform, utilizing AR-10 parts where possible.  This is a fully scaled up AR, if your familiar with
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