I agree with Matt,
I think the 140's will wake you right up with the rifle. If you reload, I would use some 110 Hornady V-Max bullets, that will make a dandy varmint gun and should shoot very well. The 110 gr Sierra Pro Hunters will do a fine job on deer also. The 110 Sierra's have been doing a great job from the 6.8SPC 16" AR's, it's a proven bullet for deer and you will see better velocity than the 6.8 is showing.