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Some calipers would probably solve that question. Take a round that does chamber fine and one that binds. Measure from the base to the datum live at the base of the shoulder, then to the base of the neck. Then measure the oal of the case and the diameter of the neck while loaded. Measure the diameter of the case at the datum line at the base of the shoulder, bet you find the one that binds is different in the shoulder area.
I had a 243 that did that with reloads. I actually had to take the die and stone off a few thousandths from the base so it would reload. Dang fine shooting rifle though, just tight chambered
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