While I have no way to retrieve slugs and measure expansion, I know for a fact that Speer GD+P 124 gr feeds, fires and ejects reliably in the XDsc, G26, PF-9 and Shield.

GD has been my preferred SD round for over 8yrs.
I usually buy it in the 'LE' 50 round box, as opposed to the usual 20 round box.