Welcome OC
While I am sure you know a lot more about antelope than I do, I have some small amount of understanding concerning the difficulty of antelope at 1K DRT.
First, rangefinding is difficult and you will need a first class rangefinder and it will need to be steadied with some type of stick or tripod.
Second will be a good windmeter. As best I can determine you will get about a two hour window of time with wind under 5mph about once very three days. It is about impossible to kill an antelope past 1 K in winds over 10 mph. Every day many people claim to have guns that shoot better than mine and they claim to never miss and to routinely shoot in the 1s but they never post any dead animals. I can make a kill in about 15 mph winds up to about 800 yards and that is about all I can manage. So my advice to you is to only hunt on the calm days. Watch the weather forecast and hunt when you can make the shot if you get an opportunity
Third, an antelope at 1K is a 1.0 MOA target. This requires an accurate rifle with good glass. A fast muzzle velocity with a very high BC bullet is just very helpful.
Fourth, there is a certain skill level required. This is accomplished by practice and not just with a rifle at a range but practice in the whole hunting setup including making a first round cold bore shot.
Finally, you should understand that you may miss or make a less than wonderful hit. Things go wrong on occasion at short and at long range and that is just the way it is.
Once again, welcome and I look forward to watching your progress toward your goal.