How many times was the old brass loaded? If it's not very old and primer pockets are still tight, you can full length size it and use it in your new rifle. With new brass, it's a good idea to run it into the size die to straighten out any dings in the mouth of new cases. I also lightly trim and inside/outside chamfer new brass to smooth up the mouth of the case. After the first firing in my chamber I then switch over to neck sizing for subsequent loadings.
If you don't mind the higher cost, Lapua brass can't be beat and it lasts for quite a few loadings. Hornady and Nosler also makes good brass.
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