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A standardized medium with a density similar to human and mammalian soft tissues, into which weapons are discharged to assess the force and penetrability of bullets fired and energy transfer from bullets
For example--depending on bullet weight and barrel length, the puny diminutive underpowered .22 Short will penetrate three to six inches of ballistic gelatin (out of a rifle it will penetrate eight to nine inches).
If you're new to comparing the terminal ballistics of bonded big-game bullets, the measure for success is currently held to a 60 percent standard when tested against bare ballistic gelatin at 100 yards.
For terminal ballistics testing, properly prepared and calibrated 10% ballistic gelatin has proven to be a reliable test medium based on years of comparisons with human shooting victims and wounds in live pig tissue.