TMJ vs. FMJ

[dsb]

Okay, I have seen some TMJ ('total metal jacket') bullets for sale for a lower price than the traditional FMJ bullets. Are there any advantages or disadvantages to the TMJ design? Anyone use this type of bullet with any regularity?

 

[JoeHatley]

In general, FMJ has an exposed lead base where TMJ does not. Some indoor ranges like you to use TMJ to cut down on the lead in the air.

Many of the companies who sell plated rather than jacketed bullets use the term TMJ. Just make sure you know which you are getting.

Good Luck...

Joe

 

[dsb]

So bullet performance between the two is similar then (penetration etc.)? If so, I guess then as long as it is jacketed, I might pick up some of this TMJ.

By the way, what are the disadvantages of plated bullets?

 

[grendelbane]

The plated bullets are more fragile than the traditional jacketed bullets. If you are seeking penetration, the traditional jacketed bullet should be your choice.

I have seen the aftermath of a plated, round nose bullet striking bone. The bullet fragmented severely.

In gelatin, I doubt that there would be that much difference, but with a hard target, the jacketed bullet will probably penetrate much further.

All anecdotal evidence and conjecture, though.

 

[Jack19]

You know...really...shoot until the threat stops; no matter what you're carrying. Which is a heck of a good argument for carrying more bullets.

 

[45R]

I use both TMJ and FMJ the TMJs are usually 124 gr. Both offer great penetration for taking out bulls eyes

 

[James Bondrock]

TMJ is a thick (thickness varies by manufacturer) plating over the entire bullet. With FMJ bullets, the jacket is formed over the nose of the bullet and rolled over the edges of the base, leaving lead exposed in the middle.

I had thought that Speer (who pioneered the TMJ process) had this term copyrighted, but apparently not.