a .243 is great for mule deer out to three hundred yards. but the bullets have to be light and have good penetration and seldom do you find this combination. I would most definatly hunt with the 7mm. If you hand load try a light charge and persay a 139 sst from hornaday. now a gun is a gun and they only do there job when used properly. the reason the sst are good is because you can make a shoulder shot and still get good penetration so at ranges like that your not really gonna wanna track a deer even farther so a shoulder shot should be a consideration.
nothing against a .223 but it should be noted that most states have a min. of .24 cal for centerfire rifles used to take Deer and similar size game animals. Check your local regulations before using a small calibre rifle for Deer.
Fuzzybear; I use a 22-250 for deer here in North Carolina. It’s legal and deadly. The combined technology 50-grain bullet with H 380 powder is a great combination. I always get pass-through shots no matter where it hits. Also remember we use dogs to “move” the deer down here. I have yet to loose one or have one to run more than 50 yards. The largest deer I have taken with this rifle / bullet combination is 203 LB’s (on Foot).
I owned a 243 win for many years and was always going to try the 80gr core locks. Being satified with the 270 win and 130's, I never attempted it. But then again, all of my hunting has been in the vast western states.
I could see the small band of mule deer picking their way towards me through the sagebrush 800 plus yards away. With my 10 power binoculars I spotted a legal buck bringing up the tail. I dropped down and crouched behind a large chunk of sage just waiting for them to pass within range. Unfortunately, they stopped and began milling around before finally settling down, with a few of them laying down right out in the open. They were not going to come to me; if I wanted any closer, I'd...