you can use something like JB weld or another similar substance to fix this. I used to do this for the most common bullets I loaded. Get your bullet and coat it with mold releasing spray or wax. Put enough of your chosen filler material in the seating stem, and then put the bullet in the stem and ensure there is a nice fit that is well aligned. allow the compound to dry and remove the bullet.
The other way is to take lapping compound put it on the bullet where it makes contact with the stem and go to work lapping them.
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