Warning, I’m going a little off topic from a 223…
I’ve killed deer with Sierra’s 85gr HPBT too, dang good bullet!
If a deer is not alarmed, just about anything will put them down in their tracks with a well placed shot. But an alarmed deer high on adrenaline is very difficult to put down, even with a very well placed shot and especially if this is a slower moving bullet like from a 308. This has been my experience anyways.
I’ve dropped deer in their tracks at 75ish yards with a 185gr HP from my 8” 44 Mag revolver. It was feeding and had no idea I was there. I’ve dropped running deer with my 308 and watched them get back up and continue to run. One got away from me and another hunter shot it a few hundred yards away. All the deer I’ve killed with the 22-250 either dropped on the spot or dropped within 50 yards. I think it’s from hydro static stock or whatever you want to call it.
So, would I use the 223 as a deer cartridge? Yep!
I’m not a trophy hunter nor do I need the meat. If I wanted a trophy buck or needed the meat “right now”, I’d use my 300 WSM loaded with Hornady 165gr Interbonds. Which I loaded this way specifically for the chance at a trophy buck knowing I didn’t need a perfect angle to put one down. Never killed that trophy but did take a couple of bucks with it, one a broadside chip shot about 60 yards, the other was charging hard from a drive that ran 50 or 60 yards. 2 hole bleeder and he was pretty well drained when he dropped! But if were going out just to spend some time in the woods and maybe shoot a deer if the opportunity came about, I wouldn’t worry one little bit about hunting with a 223. Any shot I took would be a guaranteed kill shot or I wouldn’t take it.
It comes down to the hunter and their reason for hunting.
Ok, farther off topic but a pretty good story…
Reminds me of a hunter from 40 years ago. He was an all too typical hunter from Pennsylvania. No land of his own, spot lighted a lot which was his scouting. Was basically a road hunter and never got far from his vehicle. Shot his rifle about 3 shots a year to make sure it was on paper. He bought a 300 Weatherby Mag for a long range deer rifle and wanted me to load long range loads for him. I’d shot the rifle with 180gr factory loads as did he. Yeah, it kicked more than I liked and he was scared to death of it. He wanted it loaded with 150gr bullets to reduce recoil and get more velocity and I wasn’t going to argue with him. I don’t remember how well it shot because of what happened when he did shoot it.
Picture this…. Shooter at the bench, looking through the scope, rifle is on sand bags front and rear, he’s trying to get comfortable, looking through scope, pushing the rifle into the bags, pulling it tight, more pushing gun down into bags, fiddle farting around for at least 3 or 4 minutes. We didn’t think he was ever going to shoot! When he finally did, and I’m not making this up, front and rear scope covers came off the scope, his hat was knocked completely off his head and his glasses were hanging off one ear. We thought the gun blew up! It hadn’t, it was all his reaction to the shot because he was so afraid of it! Us watching him laughed our butts off! I think he shot it again but I’m not positive but I did as did a couple others and the loads shot ok.
He killed a buck with it that year. He was walking through a golden rod field and a buck jumped up in front of him 20 yards away. He shot from the hip, taking its privates off and then killed it with another shot. We always kidded him about his long range rifle.