The differences between 6.5mm Creedmoor and .308 Winchester in relatively similar-weight bullets are interesting when applied to a simple test.
In the above, Edwin Sarkissian uses Underwood ammo for both — 165 grain on the .308 and 140 on the 6.5mm — against 26 sheets of 24-gauge sheet metal to make an ever-expanding hole.
Want more? How about pitting the same against phone books?
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