Expanding FMJ?

I'm personally looking in to another gun purchase when I get my tax return this year. Besides just the ammo issue, I'd like a better gun.
 
I have read that the EFMJ (now called "Guard Dog" by Federal in civilian loads) uses a different polymer in the military loadings. It is able to be seen on Xray easier so that a polymer fragment could be found and removed by a doctor.
 
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