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Posted: 4/4/2012 3:20:09 PM EDT
[Last Edit: AeroE][Edited]
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Bullet: 52 grain MatchKing
Intended use: training, plinking, varmint killin', and reduced course Highpower competition Notes\Comments: Reloder 15 is slow for this combination of bullet weight and case capacity, hence the 27.0 grains fills a Winchester case to the bottom of the neck. More gunpowder to 27.4 grains is safe, but spills before the bullet is seated as it fills the case to the top of the neck. In my experience 26.8 grains produces too little pressure to seal the case well, resulting in excess soot on the case shoulders. Cases are generally sized with a 0.245 inside diameter bushing through three loads, then 0.244 after that. Cartridge headspace is set 0.0015 to 0.002 inches, or about 1.7XX from the case head to the 0.330 inch diameter datum on the shoulder. Cartridge/Caliber: .223 Rem Case manufacturer: Winchester Case length: 1.75 to 1.76 inches Bullet manufacturer: Sierra Bullet weight and type: 52 grain MatchKing Powder type: Reloder 15 Powder charge weight: 27.0 to 27.4 grains OAL: 2.25 to 2.26 inches Primer: Remington 7 1/2 Firearm tested in: AR based across the course rifle, Lilja 7 twist 3 groove barrel 24 inches long Chrono data (Avg, ES, SD): 3200+ fps |
Remember Braydon Nichols and his Dad, Chinook Pilot CWO Bryan Nichols, KIA in Afghanistan 6 August 2011
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