I don't know about fragmenting.
Double Tap lists the 80 gr, TAC-XP , load for limited penetration.
"This load is an excellent choice for home defense or CCW where limited penetration is needed. You will get excellent stopping power with less chance of overpenetration. "
I'm under the notion that the Barnes solid copper bullets mushroom every time.
They must work or else people wouldn't buy DPX or any other Barnes product.
DT also offers smoking hot 115 gr. TAC-XP.
That's what my home defense CZ P-01 is loaded with.
For penetration concerns, wanting something deep driving..there are always the
147 gr. loads from DT and other sources.
I've never been impressed with 147 gr shooting reports or actual media tests.
Seems like the old designs were too slow and failed to wound or expand
with satisfactory results.
New designs like the Ranger and others are better.
Now that PRo Load is out of business or hard to locate..
I'll only buy/ carry the Double Tap in 147 due to the enhanced velocity.
Just like choosing a gun, we all make ammo choices, good or bad.
I also like the Hornady FTX concept, if even they are a bit underpowered for some in 9mm.
Something that expands everytime in all medias, is noteworthy, but DPX and
other Barnes loads have a good track record on the street and in the fields.
However- I'm not sure what bullet the DPX line uses, just that it works wonderfully and has a legion of fans that will buy/trust nothing else.,