As I mentioned earlier, I have used a body die on loaded ammo. I sold my 260, for which I had about 75 loaded rounds, and bought a new 260. The new one had a tighter chamber and I couldn't use the previously loaded ammo. I worked up some new loads for the new 260 and found that the new rifle liked the exact same load that the old rifle did. On advice from this forum (Brian, I believe), I got the body die and used it on the loaded ammo. The 'old' ammo shot into the same tight group that the 'new' ammo did.
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