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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How to over come overbore?
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<blockquote data-quote="daveosok" data-source="post: 64198"><p>I had a long discussion with Dan Lilja a few years ago that lead to the building of a 34 in barreled 7mm stw. Dan had said that the stw case was extreme overbore and that to utilize the case capacity for maximum velocity 34 inches were needed.</p><p>I built the stw and am able to launch 180 Berger behind 74.5 grains of H1000 at 3100 fps.</p><p>I see a lot of posts on here about 6.5mm on huge cases. </p><p>From my conversation with Dan it seems there are two ways to overcome overbore;1) use faster burning power, 2) use extremely long barrels. The latter seems to reach its end quicker than the long barrel length.</p><p>There seems to be some sort of length to case capacity ratio that would net maximum velocity. </p><p>Where is the line drawn or is there even a line for case capacity and bore size. </p><p>This is just a discussion and answers are welcomed in any form. </p><p>Dave</p></blockquote><p></p>
[QUOTE="daveosok, post: 64198"] I had a long discussion with Dan Lilja a few years ago that lead to the building of a 34 in barreled 7mm stw. Dan had said that the stw case was extreme overbore and that to utilize the case capacity for maximum velocity 34 inches were needed. I built the stw and am able to launch 180 Berger behind 74.5 grains of H1000 at 3100 fps. I see a lot of posts on here about 6.5mm on huge cases. From my conversation with Dan it seems there are two ways to overcome overbore;1) use faster burning power, 2) use extremely long barrels. The latter seems to reach its end quicker than the long barrel length. There seems to be some sort of length to case capacity ratio that would net maximum velocity. Where is the line drawn or is there even a line for case capacity and bore size. This is just a discussion and answers are welcomed in any form. Dave [/QUOTE]
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How to over come overbore?
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