Difference between FMJ and TMJ

I could be wrong on this but my understanding is that TMJ entirely encloses the lead portion while with FMJ it may not entirely enclose the lead at the rear of the projectile.
 
TMJ usaly plated so the total bullets coated fmj has no jacket on the base. TMJ is usaly cast plated. And FMJ is form fitted to jacket.
 
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