I have limited experience shooting deer with hardcast bullets, but my experience parallels shooting deer with a 223. Nearly all the time, they don't react to the shot much, unless the CNS is hit. With 357 though 45 Colt. Even punching both shoulders. The deer haven't even definitively acted wounded, until they fall over. Which has been within 25 yards every time. Like you, I am a shoot, and shoot again guy though. If they don't drop, I shoot again. If they do drop, I make a mad dash to go put one into the base of their skull. I've seen too many rodeos with all sorts of bullets. Handguns and small caliber bullets from rifles don't seem to cause a lot of reaction (unless a CNS hit), but I don't mind. I am not a "shoot, then admire the shot" guy.
In planning to use cast bullets in a 9mm carbine for deer (and bigger animals), the goal will be to shoot a few times, as you described in your experience, but to try to place at least one shot through the shoulders. Those bullets have been accurate enough that a neck/spine shot is a likelihood.
I am curious what you expected out of the hardcast bullets in 10mm through the lungs that didn't happen.
Thanks for the comments HnS. I wasn’t being particularly knowledgeable, but I had read how the wide meplat on HC bullets can create a permanent cavity larger than the bullet, and I was kind of expecting that to happen. But the holes and bullet paths were just the same diameter as the bullets.
On that hunt, I primarily was trying to get my, then 13-yr-old, son his first deer on a friend’s farm after we had been backpack hunting in the NF for a few years without success. It was a few hours before we had to pack up on a Sunday and head home. A few times that trip I had passed up shots on deer so that my boy would have a better chance. For example, one time, he was up in a tree stand and had no shot at a deer because another tree was in the way. Whereas, I had a good shot from the ground. I decided then that tree stands primarily are best left to bow hunters. My boy had decided, as time was expiring, that I should take a deer if I again had a shot and he didn’t because he wanted to be in on a deer kill. So, with my G40, I decided to loop way around in one direction and come back at him from beyond the direction where we had seen some far off deer earlier.
As I was about 150 yards away from, and out of sight of, my boy, a deer walked up profile 55 yards away. I drew and fired. I thought I somehow had missed. I didn’t want the deer to escape wounded if I had hit him or escape unwounded if I had not. So, a millisecond later, I put three more rounds into him. When I walked up to him, he was still twitching. So, I put one in his neck up close to put him out of any agony.
When I walked back to my boy, he said: “Dad, did you get attacked by a bear?”
When we butchered the deer, we saw that all four bullets went through both lungs. My son got his first deer the next weekend.
Just for my own purposes, and acknowledging that numerous people have had great success with HCs, I have moved on from them, and tend to agree with Mountain10mm.
When deer hunting where there are no bears, I just carry hollow-points because I think, from my own perspective, they would be more effective on deer. I’m usually rifle hunting, so I haven’t shot any more deer with a handgun since that one described above. However, this year, we got an unexpected opportunity to hunt on my fiance’s friends’ farm in MD, in a shotgun/straight-walled cartridge only county. My boys got the only two rifled-barrel shotguns I have, and I don't have a rifle chambered in a straight-walled cartridge, except for a 10mm carbine which currently is on my property in Colorado. So, I carried UW-loaded 155gr XTPs that my DW Bruin launches at 1,575 fps. Didn't get a chance to try it out though.
For bigger things, I carry the UW-loaded Lehigh Xtreme Defense or Xtreme Penetrator loads. A few years ago, I did a bunch of research on them, including watching/reading reports about them from successful hunters. They seem to be almost as violent as HPs, but penetrate a lot deeper.
In case you’re bored, here are a few videos of testing them on various media along with HC and HP loads:
https://www.youtube.com/watch?v=Cp7_gBVZ3Cghttps://www.youtube.com/watch?v=9VAbKWLGciEhttps://www.youtube.com/watch?v=mvsE9ENCJ5ohttps://www.youtube.com/watch?v=ZMiE-MXJLsIhttps://www.youtube.com/watch?v=WDvzul3rvTkThe HCs definitively are the king of penetration, at least through wet stuff: See
https://www.youtube.com/watch?v=s7rcZGuZfQkI just don’t think I need 10 feet of penetration around here and would rather have bigger wound channels. YMMV.