3 gun shot timer meat target Ballistic gel 18 inch BB pellet penetration, real calibrated usefulness

if velocity X 2 will yield about 4 x the penetration, then velocity / 2
will yield about 1/4 the penetration ? unless its dune the movie

a BB pellet at 590 Fps results in a penetration of about 85mm in gel & the same projectile & speed results in a penetration of about 88mm into the leg of a freshly killed pig including skin, duncan McPherson's bullet penetration
modeling the dynamics & incapacitation resulting from wound trauma,
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Ballistic gelatin's usefulness for very low velocity projectiles can be limited , but it's density & viscosity made to match pig muscle tissue that was found to be ballistically similar to human & animal muscle tissue but does NOT model the tensile strength of muscle as living tissue is very flexible & Dead tissue isn’t
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INS National Firearms Unit's 89mm or 3.5" penetration calibration is, fire a "BB" over a gun chronograph & measure the depth of penetration till a .177" or 4.5 mm diamerer steel ball fired from an air gun at a velocity of 183 m/s or 600 fps will penetrate 83mm to 95mm or 3.25" to 3.75" into the gelatin

18 inches is "gel" depth at which you could reasonably expect to hit a
vital organ in the human torso, from any angle & or through sternum or rib

by mass dissolve 1 part 250 bloom type A gelatin into
9 or 4 parts warm water at or below 40 °C 104 °F &
then it is chilled to 4 °C (39 °F) or 10 °C (50 °F)

the FBI 10% solution is chilled to 4 °C (39 °F) after 9 parts by mass of warm water at or below 40 °C 104 °F dissolves 1 part of 250 bloom type A gelatin

the NATO 20% solution is chilled to 10 °C (50 °F) after 4 parts by mass of warm water at or below 40 °C 104 °F dissolves 1 part of 250 bloom type A gelatin

my WTF 15% solution is chilled to 7.2 °C (45 °F) after 17 parts by mass of warm water at or below 40 °C 104 °F dissolves 3 parts 250 bloom type A gelatin

https://en.wikipedia.org/wiki/Talk:Ballistic_gelatin