''Politics is for the present, but an equation is for eternity.'' ―Albert Einstein
Full disclosure per the Pistol-Forum CoC: I am the author of Quantitative Ammunition Selection.
He didn't test the expansion using the shield.
The only youtube test I'm aware of is this ~10 year old one from shootingthebull (note he had 975fps where TNoutdoors 9 had 933 fps):
I'll take the additional data seeing that 147 hst bullets from 3" barrel pistols are very likely just above the expansion threshold in the "properly calibrated test" and reasonably conclude they may not expand:When it is easy enough to use either 10% ordnance gelatin or water—both of which are proven soft tissue simulants—to obtain valid test results, it appears that both physical and intellectual laziness are significant factors that drive such individuals to rely upon the Clear Ballistic Goo.
- Against increasingly fatter perpetrators with much lower average tissue densities than the average 1970s-1990s soldier for which 10% ordnance gelatin was calibrated (the whole reason the IWBA came up with the 4 layers of denim test was because CHP was seeing failures to expand when shooting 80s & 90s fat guys. 2020s fat guys are much fatter).
- At distances greater than 10 feet (Elijah Dickens neutralized a threat at 120 feet which may lower 9mm bullet velocity as much as 10%)
- With ammunition that has been stored under less than ideal circumstances: carried for years in sweaty & humid conditions, left in the trunk of a car in subzero weather and suddenly called to action (there is a ~50fps difference between 135°F ammo and 20°F ammo), etc.
Last edited by 0ddl0t; 02-14-2024 at 05:13 PM.
''Politics is for the present, but an equation is for eternity.'' ―Albert Einstein
Full disclosure per the Pistol-Forum CoC: I am the author of Quantitative Ammunition Selection.
Thanks so very much for the help fellows.
I'll probably run a test (accuracy, felt recoil, etc.) between the standard and +P 124 gr HST ammo in my G43X. Then I'll order a case and forget about it
Chris
Type 250A ordnance gelatin was calibrated to match penetration in swine rear leg muscle.
The overwhelming force resisting bullet penetration in soft tissues is inertial force. Depending on the cartridge, the inertial force involved ranges from several hundred pounds to thousands of pounds resistance to bullet passage.
Whereas the different densities of various soft tissues is the result of shear force. The shear force resistance to bullet passage is less than 50 pounds. Shear force doesn't become a factor in bullet penetration until the bullet is near the end of its penetration path and has slowed substantially.
The huge difference between inertial force resistance and shear force resistance is the reason why criticism about "homogenous ordnance gelatin" is irrelevant.
Calibration of properly prepared Type 250A ordnance gelatin, with a BB fired at 590 fps penetrating 8.5 centimeters +/- 9 millimeters, verifies the gelatin possesses the same shear force resistance at lower velocities as typical soft tissues.
Properly prepared and calibrated 10% Type 250A ordnance gelatin is 90% water.
There are more hard barrier test events (windshield glass X2, sheetmetal, plywood, sheetrock) than the heavy clothing test event in the FBI's test series. Back in the day, this situation inadvertantly encouraged ammo manufacturers to design bullets that penetrated well against hard barriers than to design bullets that reliably expanded after passing through clothing. This flaw led CHP and Duncan MacPherson to develop the four-layer heavy denim cloth test.
Last edited by Shawn Dodson; 02-14-2024 at 11:49 PM.
Agreed. Since inertia is directly proportional to mass and mass is directly proportional density, we can reasonably summize a bullet will experience ~10% less inertial force in the first 3 inches of fat than in the first 3 inches of ordnance gel (fat having ~10% less density).
Thank you for your clarification as to why 10% Type-250A ordnance gelatin is a valid soft tissue simulant. There appear to be multiple competing 'narratives' being propagated across the 'net—driven either by ignorance of technical matter and/or an agenda intended to discredit the medium for certain commercial purposes—that need to be countered with a factual account of why ordnance gelatin is a valid test medium.
Unfortunately, the latter motivation seems to have been a large driver of the low quality—and misleading—test videos swamping the 'net today.
''Politics is for the present, but an equation is for eternity.'' ―Albert Einstein
Full disclosure per the Pistol-Forum CoC: I am the author of Quantitative Ammunition Selection.