I lived in the little town of Cache OK, just outside the Wichita Mountains Wildlife refuge for over 50 years. I started applying for an elk tag when I turned 18 and every year since. The first drawings were held in the Cache High School gym and you had to be present to be eligible to draw. While I have drawn numerous special hunt tags over the years, including the coveted antelope tag, I have never drawn the elk tag. I did get to play host to numerous friends and family members who were lucky enough to draw. I did the next best thing, I volunteered to help with the hunt for many years until my first knee surgery. Over the years, I got to see a wide variety of hunters and rifles including a 79 year old lady shooting a Savage model 99 in 300 Savage who took a cow elk at 175 yards and a man in a wheel chair shooting his dad's old 30-06 to take a nice 6x6 at 40 yards. My job as a helper was to help the hunter get their elk out of the field and gather data and tissues samples for the biologist. These animals are big, as big as any western state elk, according to the biologist. The majority of the hunters were overwhelmed and unprepared for the size of these animals and struggled with field dressing. I saw first hand the terminal performance of an assortment of different caliber/bullet combinations when field dressing multiple elk a day. Like the OP said, minimum cartridge requirement is 270 or larger with a 5 round limit per day. I worked closely with the biologist to gather data including caliber/ bullet weight, number of shots fired, number and location of bullet hits, and shot distance along with heart, liver and fetus tissue samples. Most of my volunteer time was between 1988 and 1996. Stats and norms didn't change much during my time. Most popular cartridges were 30-06, 7mm mag, and 300 Win mag in that order. Bullet weights were 180, 175, and 180 respectively. Average shot distance was 160 yards (corrected) This was before rangefinders and a good many range estimations we grossly exaggerated, part of my duties were to give realistic range estimates for data gathering. This data was from hunters that I personally assisted and interviewed, I did not meet and collect data from every hunter. This hunt is usually a 3 1/2 day hunt that is comprised of multiple hunt units with boundaries. You are required to stay within your unit, average unit size was slightly less than 1 square mile. The hunt coordinators can move you to a different unit at their discretion based on harvest quotas. This is a tough hunt with steep, rocky, extremely rugged terrain of oak brush, boulders and lots of grass. While a 1k shot would definitely be possible, given the limiting unit parameters, the opportunity would be unlikely to happen. I'm certainly in favor of expanding the selection of available rifles for whatever opportunity may arise. Given my experience with the area and the hunt itself, my vote would be for the 7PRC in a easy to carry weight. It is more than up to the task and is very flexible for other target species. There will be lots of walking (especially if you draw a walk-in hunt), hiking, crawling and climbing with some sit and glass times. All units are a bit different and hunting techniques will vary from unit to unit. The trick is moving from one vantage point to the next to cover the unseen folds in the land. Limited hunt time, weather concerns and a half day before scouting opportunity means a fast paced hunt. Good luck with the draw!