Cool or freeze the meat and place in a soft sided cooler (yeti or similar). Then just carry it on the plane and put in the overhead. If TSA asks tell them it’s organic meat. I do this several times a year flying across the country and never had an issue. Pronghorn are small and will easily fit.
Do not let the flight attendants see you putting meat in the overhead, frozen or not. Was on a flight a while back and the guy a couple rows in front of me had blood leaking from his bag down onto him. They made a couple announcements about what can be stored in the overhead and they said blood leaking from bags was not particularly rare and why they made it clear fish and meat were not to be put up there. They also said the worst offenders were beer growlers letting go at altitude. I had never heard of the meat ban previously.
