Test Gun: Sig P320, P365
Barrel length: 3.9, 3 inches.
Ammunition: Federal 9mm 124gr Hydra-Shok
Test media: 10% Vyse Ballistics Gel, Clear Ballistics Gel.
Distance: 10 feet.
Chronograph: Caldwell Ballistic Precision Chronograph G2.
Five shot velocity average: 1027 , 981fps
BB Calibration: 3.25 inches.

https://general-cartridge.com/2020/04/28/federal-9mm-124gr-hydra-shok-in-vyse-ballistic-gel/

That is quite the difference in measurements, I hadn't previously seen such a large change in handgun round performance by switching between the gel types. One more reason to use organic gel, I guess.

I actually strongly recommend firing rifle rounds into organic ballistic gelatin. If anything, the difference between clear gel and organic gel is even greater with rifles, since the shear strength of the medium is likely to play less of a factor while fluid resistance and density may be much more important. As such, while I had previously accepted clear gel as more or less "close enough" with handguns, I regarded rifle tests with clear gel as largely invalid.

It is not surprising that the results do not scale between the two gel types consistently. Due to their differing properties, it is very difficult to create any kind of precise conversion equation that would work across the board. Previously I had observed that service caliber handgun hollowpoints seemed to expand approximately 95% as much while penetrating 5% more, and again figured this was "close enough", but this is the second broad experiment that shows wildly differing results. (The_Chopping_Block has noted that this may be partially because clear gel is not nearly as temperature insensitive as advertised.)

The clear gel haters are gonna LOVE this thread!

and from the test results, for good reason!

No kidding. A difference of 7 inches in penetration when you're talking about penetration in the 12-18 inch range is substantial!