Without knowing what kind of rifle You have??
Take the striker out of the bolt.
Smoke a case shoulder with a candle.
Carefully close the bolt on it feeling for slight resistance.
When you take the case back out, you should see a shiny clean ring in the soot where the case shoulder just contacted the chamber shoulder.
If you can feel it and see it, it don't get any better then that.
But while we are on the subject.
How did your .22-250 get all this excess headspace?
Unless you suffered locking lug set-back in the receiver, or a cracked bolt lug?
Might be worth having a gunsmith figure out what is going on there before you shoot your eye out.
rc