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Old September 15, 2010, 11:20 PM   #5
Loader9
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Join Date: July 29, 2008
Posts: 949
If you ever followed any of Parkers readings, he always stated that for every bore diameter there is an optimum bullet weight. That's a bullet weight that carries the most weight but does not sacrifice speed. In a .243 bore you have 60 gr bullets that can fly at the speed of light but don't carry much weight and has less energy at distance. You can shoot the heavier bullets like a 105 gr and carry more energy but not at the same speed as the 60. His opinion was that the 87 gr bullet was the optimum weight for the .243 bore, bullet construction not considered. Going to an Ackley chambering will net you about 200'ps more over a standard 243 chambering for the 87 gr bullets, per Ackley data. But you will burn 5 grs more powder to get it. Is it worth it to you? Is velocity the prime reason for wanting an Ackley chambering. If so, the 6mm/284 is eons ahead of the Ackley chambering pushing 100 gr bullets faster than an Ackley can push an 87gr. If you just want something exotic, Ackley is a good choice as is the Nieomiller where the shoulder is slightly pushed back yielding the sharper shoulder with the sides blown out to give more case capacity. You also get a longer neck which is suppose to help with holding the bullet straighter in the case for less bullet yawl. But ultimately you need to decide what it is you're looking to achieve by going the different road. If accuracy is the quest, consider a 6BR chambering. The guys are now shooting prairie dogs (targets) reliably at 1 mile with this chambering with 95gr Bergers at 3100'ps. So consider what you are trying to achieve and then pick a chambering. There is no right or wrong answer by the way.
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