Yes. I have used red deer before and I used so much Sambar I was importing it myself from India, (when that was doable). Red Deer and Elk are very close cousins and Sambar not too far off. What made Sambar so special for centuries was that instead of pith on the interior, you had a single vein down the center. So you had lots of solid material to work with. Elk and red deer lots more pith. Sometimes only a 1/4” or so of solid material on the outside. I’ve learned to cut an antler section basically in a square. What I mean by that is that when I’m done I have a square of pith left over with four scales cut off. The pith I toss away. This is possible on the main beams, as the antler sections get smaller ya might get three scales and then two once ya get down towards the end of the tines. Texture is what I’m looking for so the end of the tines don’t get used for knife handles either. I also save all the crowns, they aren’t very useful for handles. Sambar now isn’t what it use to be and this is something I have seen in my knife making career, the deteriorating of the quality of Sambar. Apparently Sambar are close to other deer species and they have been interbreeding. You are seeing more and more pith in Sambar these days. Not as much as elk…. yet, but I haven’t seen any with a single vein hole in a long time either. I've never used Caribou. I have made wooly chaps out of both bear and buffalo but I don't think that counts!
Funny story. Years ago over in the General section here on BF, there was a similar discussion of the merits of different antlers and how they are used in knife making. Unlike here, there was a lot of armchair pontification going on. Ya actually wondered if some of these folks had ever even seen a deer. After several pages, I entered in and basically explained my experience and info I had, same as I have here. An older gentleman contacted me privately and thanked me for putting in my two cents worth. He said that thread was getting crazy. "You showed up and it was like Seal Team Six coming to the Cub Scout meeting!" That was years ago but I'll always remember that. That was funny! Haven't seen that gentleman around in a while, hope he is still with us.