I never shot a deer with a CM but I have taken a lot of deer with a 243 Win. The CM has more than enough energy to drop a deer. The two critical issues regardless of cartridge selected, are shot placement and terminal performance of the bullet.
Your desire to drop a deer in place is the desire of ever deer hunter. But hunting is not target shooting. The unexpected can always happen, such as the deer moves just as you are touching off a shot resulting in a less than optimum shot placement.
Here's a true story. Several years ago, the farm where I use to hunt deer, the son of the farmer, an experienced deer hunter and above average field shot, knocked down a large 10-point buck with a 7 mm magnum. When he approached the deer laying in the field, the deer got up and ran off. We tracked and searched for that deer for several hours than night and the next day and never found it. Nothing is absolute when it comes to hunting.
You can maximize are chances of success by becoming a proficient field shooter, knowing the maximum distance that you can place a shot in the vital area under field conditions, and selecting a hunting bullet that has a history performance on game animals. If the deer runs off, make a mental note of where the shot was place and mark the point with a ribbon when you approach it. That will provide an accurate location to start tracking if necessary.