I have two 30-06 rifles. One is a modern Remington 700, the other is a 1936 vintage Model 1903A1. The 1903 was rebarreled in 1942, and whoever did the job cut the rear of the chamber slightly oversize (by 0.001"). Many cases fired in that M1903 will not chamber in the Remington, even after resizing. The area in question is just ahead of the rim and apparently is not affected by resizing. So I use separate cases for the two rifles. Different headstamps. I have heard that this is not uncommon.
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