TC packages the .40/180 XTP as their .45 sabot/bullet offering. Their name implies greatness:

".45 Caliber Super XR Sabots With .40 Caliber 180GR XTP Magnum Bullets (30 Pack) by T/C ACCESSORIES". http://<a href="http://www.midsouths...30_Pack%29</a>

Hornady shows: 700 - 1200 fps for .40/200 XTP; and 750 - 1450 fps for .40/180 XTP.

Maybe TC picked the 180 for it's higher velocity. Others on the forum have reported good results for the 200.

Someone reported being able to use the .41/210 XTP in a crush rib sabot. Hornady shows 800 to 1600 fps for this.