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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
270 Thor's Hammer and 270 PRC and 27 Nosler
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<blockquote data-quote="rbTanzan" data-source="post: 2553470" data-attributes="member: 53978"><p>In comparing items like the 270Win, 270AI, and 270TH, it would help to have some of the bare physics stated as well as any special effects like throat-changes and free-bore. </p><p></p><p>How many grains of capacity does the 270AI have over the 270Win? (My estimate: 3 grains)</p><p>And how many grains of capacity are provided by seating a 270TH forward an extra .29"? (My estimate: 6 grains)</p><p></p><p>For example, the 270AI seems to only have a 3 grain increase in capacity. That might be good for about 30-35fps, IF barrel, powder, bullet, primer, and case architecture remained the same. </p><p>When people claim 100-150 fps increases in a 5% capacity increase, they are doing that by switching to more optimal components and by allowing the loads to run up to higher pressures. </p><p>However, if a 270TH finds an extra 10-15% capacity by extreme seating out into freebore, then so be it. I would believe an extra 100fps with same pressures, or perhaps 100-200fps with higher pressures.</p></blockquote><p></p>
[QUOTE="rbTanzan, post: 2553470, member: 53978"] In comparing items like the 270Win, 270AI, and 270TH, it would help to have some of the bare physics stated as well as any special effects like throat-changes and free-bore. How many grains of capacity does the 270AI have over the 270Win? (My estimate: 3 grains) And how many grains of capacity are provided by seating a 270TH forward an extra .29"? (My estimate: 6 grains) For example, the 270AI seems to only have a 3 grain increase in capacity. That might be good for about 30-35fps, IF barrel, powder, bullet, primer, and case architecture remained the same. When people claim 100-150 fps increases in a 5% capacity increase, they are doing that by switching to more optimal components and by allowing the loads to run up to higher pressures. However, if a 270TH finds an extra 10-15% capacity by extreme seating out into freebore, then so be it. I would believe an extra 100fps with same pressures, or perhaps 100-200fps with higher pressures. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
270 Thor's Hammer and 270 PRC and 27 Nosler
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