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GeauxTide, those spitzers having more bearing surface will give less pressure if their jacket's are softer, thinner, shaped slightly different or slightly smaller in diameter than others. I doubt the difference will be measureable anyway. Have you measured the pressure difference, or are you only guessing?
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I'd be willing to guess that Hornady or Nosler (for example) use the same jacket material and 308 diameter in their spitzers as their 30-30s, with the exception of the bonded lines. Then, it's no guessing that a longer bearing surface would give more pressure.