dak0ta
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- Joined
- Feb 14, 2008
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Can somebody suggest some good reading on how to understand what makes an efficient cartridge based on case design, powder burn rate, projectile weight and shape, and bullet diameter?
I've read that the .308, .30-06, 6.5x55, 270 Win, 8mm Mauser are all efficient cartridges if shooting the heavier bullets for caliber. For example, the 8mm Mauser is more efficient shooting a 200gr bullet compared to the .30-06. Is this because the .323 caliber's slightly increased bore diameter over .308 cal allows for more surface area for the expanding gas pressure to push the heavy for caliber bullet down the barrel, hence providing more velocity for a relatively equivalent powder charge in the 30-06 and 8x57 cases? But a 30-06 can shoot the 165-180gr bullet more efficiently vs the 8x57 because the lighter bullet weight is more efficient in the smaller caliber?
I've read that the .308, .30-06, 6.5x55, 270 Win, 8mm Mauser are all efficient cartridges if shooting the heavier bullets for caliber. For example, the 8mm Mauser is more efficient shooting a 200gr bullet compared to the .30-06. Is this because the .323 caliber's slightly increased bore diameter over .308 cal allows for more surface area for the expanding gas pressure to push the heavy for caliber bullet down the barrel, hence providing more velocity for a relatively equivalent powder charge in the 30-06 and 8x57 cases? But a 30-06 can shoot the 165-180gr bullet more efficiently vs the 8x57 because the lighter bullet weight is more efficient in the smaller caliber?
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