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To test that claim, I fired two .30-06, 150-grain GMX bullets point-blank into Perma-gel. The average penetration was 34.25 inches. The average retained weight was 149.35 grains, which, when you account for the missing plastic tip, is 100 percent. The average expanded diameter was .501 inch. To compare, I fired a 180-grain Hornady Interbond .30-06 at the Perma-gel. This bullet is 30 grains heavier and has a reputation for excellent penetration. It penetrated 24.75 inches, weighed 142.8 grains and measured .539 inch. Although the Interbond exhibited larger expansion, the GMX beat it in penetration and weight retention.