Can anybody recommend a BB gun to use for calibration/ validating a gel block at the required 590 fps? I don't have a chronograph to check speeds, so I'm unsure of which model to choose from.
Can anybody recommend a BB gun to use for calibration/ validating a gel block at the required 590 fps? I don't have a chronograph to check speeds, so I'm unsure of which model to choose from.
You have to have a chronograph to ascertain velocity of the BB. There's a chart to compare actual velocities to actual block penetration of the BB to make sure the gel block is compliant. I think the Crossman 760 is the popular test BB gun for this, but I'm sure there are others that work just fine.
Regional Government Sales Manager for Aimpoint, Inc. USA
Co-owner Hardwired Tactical Shooting (HiTS)
It appears that Part 3 has been published:
https://www.policeone.com/police-pro...kEYB93TAd5o6J/
The following conclusions, some of them oddly phrased, are made in the article:
1.The clear synthetic gelatin must be calibrated by the user before use.
2. The clear synthetic gelatin currently demonstrates a tendency to limit bullet expansion and increase bullet penetration, compared to FBI-standard, 10% calibrated organic gelatin.
3. The clear synthetic gelatin currently does not appear to be a suitable substitute for FBI-standard, 10% calibrated organic gelatin if the bullets will be measured and evaluated according to FBI performance standards.
4. There is no apparent “conversion” between data derived from 10% organic gelatin and the current version of the clear synthetic.
Last edited by the Schwartz; 01-14-2020 at 09:49 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.
While it "might" be possible to derive a scaling constant that "converts" test data for non-expanding/non-deforming projectiles obtained in Clear Ballistics Gel to its equivalent in 10% ordnance gelatin, due to the tendency of CBG to under-drive expansion and over-represent terminal penetration of expanding designs such a scheme is simply not plausible for the projectile designs that are best suited for self-defense.
Also, not sure how I missed your posting of the publication of Part 3 of the series DMWINCLE...apologies as I wasn't aware of your post prior to mine bringing this to light. I reckon that this is what I get for not reviewing these threads as thoroughly as I could/should.
Last edited by the Schwartz; 01-17-2020 at 04:52 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.