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The 270 is more powerful. The .270 has a slightly larger projectile in diameter (.277 vs. .224) and a significantly heavier bullet (between 90 and 150 grains, vs. 45 - 80 grains for .223/5.56 loads). Additionally, the .270 utilises a much larger casing - the .30-06 casing, necked down to accommodate the smaller projectile of the .270 cartridge.

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Q: What is more powerful a 223 or 270 caliber rifle?
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