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Old January 28, 2002, 05:18 AM   #1
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What is the difference? Are TMJ bullets the same as the FMJ, just a word SPEER uses or what? If they are different, and not just a lingo, is there any difference such as performance or safety for indoor ranges? Just a curious dumb question for you guys, thanks!
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Old January 28, 2002, 06:38 AM   #2
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FMJ usually leaves the base exposed lead; TMJ is completely covered with NO exposed lead.
"all my ammo is mostly retired factory ammo"
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Old January 28, 2002, 06:45 AM   #3
The Reaper
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The FMJ is jacketed everywhere except the base, which you don't see when it is loaded in a case. The TMJ is jacketed everywhere including the base.

Bullet Descriptions Here

The TMJ shouldn't put as much, if any lead in the air, or in the range area until it hits the backstop. So for the range operator there is a small benefit, but only if everyone uses TMJs, which they don't.

As far as performance differences, well that varies by firearm. Some firearms shoot certain bullet weights better than others etc. You just need to test with different ammo to see what works best in a particular firearm for you.

No stupid questions, right? This comes up in every class I've been to or done.
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Old January 28, 2002, 05:47 PM   #4
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Thank you for your answers and explanations. Much appreciated!
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Old January 28, 2002, 11:04 PM   #5
Shawn Dodson
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The copper jacket is electo-plated to the entire lead core, totally encapsulating the core. Hence Speer's terminology "totally metal jacketed".
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