I sized 30-06 brass up to 35 Whelen using a 358 Winchester die set not to touch the shoulder and then used the same dies to load ammo with. This is 100% neck sized and it has worked perfectly for 300 shots or so out of the same 60 pieces of brass.
I once ate spaghetti with a spoon too.
Then I discovered there was a correct way to eat spaghetti.
Why would you say such a thing? There are multiple ways to do everything, I don't think any of us meant to suggest otherwise. Not all are safe, not all smart, not all are correct. We have outlined the correct and acceptably way to reform a case to another caliber.
BTW, some critical case dimensions for those two calibers are different, specifically the neck lengths. You would need to get the length set so as not to make too long or too short a neck. Your also not "100%" neck sizing, like you think. The 358 die is partially resizing as much as it can reach.
Absolutely it can be done, your doing it. I am glad it has worked for you. But its certainly NOT the correct way to do this and not something for the inexperienced novist. You need to know exactly what your doing. It requires far more setup and accurate measuring to get it right. IMHO, it's FAR easier to screw the correct die in your press, until it touches the shell holder, lube up a case and push it in the die and remove a correctly sized case in a new caliber. No measuring, no guessing, no problems.