Bullet terms

[Casper]

What do these bullet terms mean :
HBWC
RNFP
TMJ
I know the basic terms like FWC, SWC, JSP,JHP, FMJ but I can't figure out the above terms.

Thanks.

 

[gushulak]

Hollow Base Wadcutter
Roundnose Flatpoint
Total Metal Jacket

 

[Casper]

Thank you gushulak !

 

[Clammy]

What's the difference between "Total Metal Jacket", and "Full Metal Jacket"?

Cheers!

 

[tiriaq]

A TMJ has the lead core totally covered, usually done by a plating process. FMJ is a lead core swaged inside a separate jacket - will usually be open at the base.

 

[Clammy]

A TMJ has the lead core totally covered, usually done by a plating process. FMJ is a lead core swaged inside a separate jacket - will usually be open at the base.

What's the performance difference? For instance, I've seen TMJ sold for a fair amount less than FMJ for comparable bullet weights, so would there bea big performance hit using the TMJ stuff?

Thanks.

Cheers!

 

[tiriaq]

I don't know. The total encapsulation can reduce lead contamination in indoor ranges. TMJs are probably cheaper to make. Don't know if the jacket is as thick.

 

[wobbles99]

TMJ are usually marketed with lead free primers like in the winclean line and the nt american eagles. I tried the american eagles once and found them to work good and were clean burning.

 

[PoFF]

FMJ will have an open base and a thick copper coat (1/8" thick approximately)

TMJ or CMJ are plated with copper a few thousands of an inch thick, but the jacket completly covers the bullet, with no lead exposed. A good example is those Frontier bullets sold by Marstar.

However, on impact with the range's backplates, a FMJ will deform and probably won't shear the jacket open, this will result with a bullet with a deformed nose, and with the base still open. With a CMJ/TMJ, the jacket will 'explode' on impact exposing the whole lead core.

I like those CMJ/TMJ because they're cheap, replicate the behavior and performance of FMJs and are reloader-safe (no lead contact).

Winclean ammunition does not have CMJ/TMJ 'encapsulated' bullets, they are FMJs, but inverted. The base will be covered, but the nose has lead exposed, sealed in some way with wax or something else. Also, the Win NTs I've shot (in .45ACP) had a brass jacket instead of a copper jacket, which is much harder on the barrel.