This is a good topic - many guys like me have lived with them just fine to moderate range, but going a little longer becomes more complicated. This summer I’m curious to test how far is too far to not have a level. There’s no doubt that a level rifle is essential way out there.
I bet the shooting style that barely puts the face and hands onto the stock requires a level the most, because there aren’t as many nerves inputs determining when things are good to go. I always have a moderate hold on the pistol grip and decent amount of pressure on the cheek piece so I naturally get a lot of feedback, if that’s enough to shoot 600 yards is yet to be seen, but that’s easy to test. I’m gathering a few parts to be able to temporarily put a digital angle finder on the rifle - without looking and shooting normally, a shooting buddy can say what the angle was as the shot breaks to 1/10th of a degree. I’m curious what kind of deviation can be felt, and kind of interested in seeing it’s effect on target at different ranges. Reading the error on a piece of paper doesn’t give my brain enough information to develop a feel for when a quick shot has to slowed down to make sure it’s level.
edit: After writing it out, using an angle finder seems a bit excessive. I’ll just use a scope mounted level this year and see how useful it is. Lol