The XCR-L sure do come in 6.8SPC and I went with it over a 6.5 Grendel because it was available I have uppers in 223 & 6.8SPC now.
Shot 2 deer with my 18.6" barreled XCR-L loaded with either H322 or AA2200 powder with 95gr TTSX bullets @ 2825fps & 2850fps respectively.
I like the 6.8SPC cartridge so much I also added a 23" T/C Contender carbine barrel in 6.8 to my Contender collection the same AA2200 95gr TTSX loads do 2960fps.
They are fairly accurate as well I would not hesitate if conditions are right to take a deer at 300 yards.
You can find the best 6.8SPC available here
http://68forums.com/forums/forum.php
Here is a pic of a group I shot off the back of my quad shot was 347 yards across a valley I was not holding for windage.
Here is a pic of the shot distance
Recovered 95gr TTSX shot was into moss/sand distance was 330 yards these bullets are designed specifically for the 6.8SPC and are supposed to expand down to 1600fps.
Not trophys but they were to my little guy
Bonus is you can legally use 10 round 7.62X39 XCR-L pistol mags that legally hold 11 6.8SPC rounds.
problem for me is I only ever need one shot.