You started by saying that bullets climb after I just explained in depth why that terminology is wrong. Bullets fall. Bullets only fall. If you fire a bullet at any angle less than exactly 90°, they are only falling. The only way a bullet would ever actually climb would be when pointed up at exactly 90°, then the argument could be made that they are climbing until they reach max ord, and then they fall. Your post is arguing for argument's sake. It is an important distinction since this thread of full of posts where people who have no idea how bullets fly explain with enthusiasm things that are absolutely incorrect.
The op made this post and is having a problem, and all of this has made it unnecessarily complicated. Bullets fall. That's all they do. If you point your rifle barrel at an 89° angle or a 1° angle and pull the trigger, your bullet falls from it's original angle, 100% of the time on the planet earth. You can try to muddy the water with all of the planes and get as deep into physics as you want to, but bullets fall, and that's all they do.
When everyone understands that, we can move on to the rest of it. Read the rest of the comments here, there are people who think that a 100y zero will again cross that plane at 300y, or that depending on muzzle velocity and scope height, a 100y zero can logically push you to a higher poi at 200y. Your post about line of sight and bore angle and bla bla bla starts by saying that bullets climb. They don't, they fall. They always fall. There is no climbing.