I don't think any of the major firearms manufacturers are using barrels that don't fully support the case any longer. Most of the problems with the 40's was the Glocks, but they changed their barrel design in that regard with the newer production ones, although they still have other brass issues. Your XD should be fine so load for it safely and don't look back. BTW, you can remove the barrel and place a case in the chamber and see if there is a portion of the case visible at the feed ramp cut-out as an easy test of barrel support if you are still unsure, if all you see is the case head you are good-to-go. Good luck.