Re: Bullet seating mistake
Depends on how long ago the bullets were seated.
If you seated yesterday, you'll feel about the same tension on reseating, and pressure will run with the rest of your ammo. This, provided there was no shaving of the bullet on pulling.
If the offending ammo was made awhile ago(a week or more), I'd resize the necks and wait a day before reseating. It won't hurt anything.
It probably sounds weird, but I find that brass relaxes a bit over time. Neck tension drops a bit, bodies un-size a little, bumps un-bump a little, and primers creep outward 1-2thou in a week after loading.
Now, not to generalize your problem, this may be an opportunity to find out how the gun shoots at that setting. You never know man..