No I have not tried the stripped bolt method.
I can close the bolt on that bullet at 3.59 and I think the short picture is 3.47 but I can’t remember exactly now. It is a 178 amax that’s in the pictures above but a 220 smk will do the same thing.
So I found that if you remove the firing pin assembly and the ejectors your bolt has no tension whatsoever and just "flops" around for lack of a better word. This allows you to really get a feel for what the bullet is or isn't contacting during chambering. Here is the link to the video that talks about the method...it really helped me out.