I run a Mechtech upper on my Glock 20 and the accuracy is astounding with 200 grain WFN GC PC Cast bullets. But as far as XTP in the 10 lighter and faster is what I prefer. That said the cost on these projectiles is ridiculous. This is why I cast my own and load my own. When you run a WFN hard it doesn't need to expand I have taken many deer with this combination with great success. Handguns and the XTP though light weight drive them hard.