And I eventually pulled a bullet from a sample of all the factory loads I tested to measure the propellant weight. Give a Gift If I’m not getting the accuracy I want, I will look to the Redding Instant Comparator to measure the amount of stretching (at the shoulder) I’m getting in the particular rifle’s chamber. Again, this program proceeded so slowly that ArmaLite eventually sold the new rifle’s production rights to Colt. To get started, click the link below to visit mymagnow.com and learn how to access your digital magazine. I also compared that data with other recent loading manuals just to make sure caution prevailed with my test loads. For larger or tougher game, I like the 165 and 180-grain Nosler Partition and Swift Scirocco II. Thanks for the help! Match bullet. We were just hoping to use it up but we feared if not a good match. One of the attributes of the .308 Winchester is its balanced velocity: It isn’t so fast that the cup-and-core bullets will breakup prematurely, yet isn’t so slow that the premium bullets will fail to expand. 115 SW Columbia St | Bend, Oregon, USA 97702 | Toll Free: Nosler Showroom / Open to the Public: Monday - Friday 10:00 am to 5:30 pm PST. I love the Redding Bushing die for the .308 Win. Managing chamber and port pressures is a major consideration when shooting a direct-impingement, gas-operated AR-style rifle. As the chart indicates, this general rule of thumb is not always true. I weigh it again and subtract the empty weight. When I’m loading the shorter bullets — the flat-based partition, or those with shorter ogives — I generally look to IMR 4064 and the new IMR4166, part of IMR’s Enduron line. Of course, I couldn’t keep the last round in the first four-round cluster. I had to lock the carrier back, drop a round into the chamber, and release the carrier before I could fire each shot. For the target shooter, BC is everything, especially when the distances get out toward the 1,000-yard mark. When you fire 308 handloads in a bolt rifle, all you have to worry about from a safety perspective is that the propellant gas and bullet exit the muzzle. The corresponding lower powder charges generate less propellant gas and ensure adequate chamber pressures while reducing port pressures. Multiple failures to feed, weak case extraction/ejection, blurred/burred headstamps, so-so accuracy, etc., suggested the AR-10’s direct-impingement gas system was, apparently, more difficult to manage than my AR-15’s. This has greatly increased accuracy while allowing my ammunition to feed and extract easily should I need a quick follow-up shot. Using the 300 Savage as a starting point, the new cartridge design evolved through several iterations at Frankford Arsenal.