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Long Range Hunting & Shooting
Long Action vs Short Action.
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<blockquote data-quote="nralifer" data-source="post: 2694013" data-attributes="member: 94556"><p>The picture below illustrates what I think is a problem for the 6.8 Western. According to Winchester the bullet is seated very deeply in their loaded ammo. After pulling a bullet from their ammo, they use 64.4 gr of a ball powder to compensate. I think it is Superformance or something like it. Their ammo grouped poorly for me. The loaded rounds will fit and feed through a short action Defiance which I was using. With that much powder space impingement one would be limited in using stick powders to try. A longer action would allow seating of the bullet such that the end of the boat tail reaches the shoulder/body junction and still feed through the magazine. </p><p>Another aspect that complements the longer action approach is the throat design. We had PT&G make us a stepped throat design for the standard 338 Lapua which allowed us to propel our 265 gr ICBM2 bullet to 3200 fps. It gas a G1 BC of 0.9 and from a standard throat pressures out at 3000 fps from a 30" barrel. Dave Kiff also promotes a bore rider chamber which has a longer tight tolerance free bore which has the same effect on speed. What we believe is happening is that the longer throat allows for the use of more powder while at the same time reducing how quickly the pressure spike occurs when the bullet fully engages the full thickness rifling. That way one can add more powder to achieve the same peak pressure as the shorter throated chamber but because of the greater powder charge maintain a higher average pressure throughout the bullet's acceleration through the length of the barrel, thus the higher velocity.</p></blockquote><p></p>
[QUOTE="nralifer, post: 2694013, member: 94556"] The picture below illustrates what I think is a problem for the 6.8 Western. According to Winchester the bullet is seated very deeply in their loaded ammo. After pulling a bullet from their ammo, they use 64.4 gr of a ball powder to compensate. I think it is Superformance or something like it. Their ammo grouped poorly for me. The loaded rounds will fit and feed through a short action Defiance which I was using. With that much powder space impingement one would be limited in using stick powders to try. A longer action would allow seating of the bullet such that the end of the boat tail reaches the shoulder/body junction and still feed through the magazine. Another aspect that complements the longer action approach is the throat design. We had PT&G make us a stepped throat design for the standard 338 Lapua which allowed us to propel our 265 gr ICBM2 bullet to 3200 fps. It gas a G1 BC of 0.9 and from a standard throat pressures out at 3000 fps from a 30” barrel. Dave Kiff also promotes a bore rider chamber which has a longer tight tolerance free bore which has the same effect on speed. What we believe is happening is that the longer throat allows for the use of more powder while at the same time reducing how quickly the pressure spike occurs when the bullet fully engages the full thickness rifling. That way one can add more powder to achieve the same peak pressure as the shorter throated chamber but because of the greater powder charge maintain a higher average pressure throughout the bullet’s acceleration through the length of the barrel, thus the higher velocity. [/QUOTE]
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