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I know we're not supposed to put raw lead in a Glock - we're supposed to have something like a copper jacket around the lead - but does anyone have experience with Underwood's "Hi-Tek polymer-based coating" surrounding the lead?

There are a number of different rounds at Underwood, typically Flat-Nosed, which are coated in that polymer, such as:

9mm Luger +P 147 Grain Hard Cast Flat Nose
https://www.underwoodammo.com/products/9mm-luger-p-147-grain-hard-cast-flat-nose
380 ACP +P 100 Grain Flat Nose
https://www.underwoodammo.com/products/380-acp-p-100-grain-flat-nose
357 Magnum 180 Grain Lead Flat Nose Gas Check
https://www.underwoodammo.com/products/357-magnum-180-grain-lead-flat-nose-gas-check
40 S&W 200 Grain Hard Cast Flat Nose
https://www.underwoodammo.com/products/40-s-w-200-grain-hard-cast-flat-nose
45 ACP +P 255 Grain Hard Cast Flat Nose
https://www.underwoodammo.com/products/45-acp-p-255-grain-hard-cast-flat-nose
10mm Auto 220 Grain Hard Cast Flat Nose
https://www.underwoodammo.com/products/10mm-auto-220-grain-hard-cast-flat-nose

[NOTE: THE ABOVE IS BY NO MEANS A COMPLETE LIST; IT'S JUST A FEW SAMPLES FOR VARIOUS GLOCK PISTOL CALIBERS]​

Are these kinds of rounds safe for firing in a Glock, or do they put you at an increased risk for internal lead buildup?

Thanks in advance for any insight!
 

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Ive fired about 60 or 80 9mms (G43 & G26). About 20 or 40 , 200gr 10mm's (G20 & G29) They seemed to work as advertised. Empty 10mm brass doesn't show over pressure like other brands I tried. Thats it for me so far.
 

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HiTek coating, when properly applied and cured, does not lead, even up to 1,500 fps.
 

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When I started reloading, I primarily used Xtreme copper coated bullets. Then I went to Bayou Bullets, which are Hi-Tek coated. I have shot many thousands since then. Now I cast my own bullets from raw lead and coat them in Hi-Tek. I couldn't be happier with the results.
 

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HiTek coating, when properly applied and cured, does not lead, even up to 1,500 fps.
Yes. Spot on.

I would add that in addition, the loader must not do something to disturb/cut the coating.

Hi-Tek, properly applied and loaded, are great in Glock barrels. This assumes that it is a diameter that is 1 thou over groove diameter.
 
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