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- Jan 26, 2015
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Along with this, after you chamber a loaded round, remove it from the chamber and look for rifling engraving marks on the bullet. Measure the CBTO or COAL to ensure the bullet is not jammed into the lands.The OP said: The bolt requires ever-so-slightly more pressure to close that with an empty fired case.
More often it's the other way around. So, perhaps the slight resistance is due to the bullet contacting the lands. Have you done a test to determine the maximum length to ojive? Does the slight resistance go away if you seat the bullet a little deeper?
After chambering one of these rounds, do you feel the same resistance when closing the bolt a second time on the same cartridge?
A close inspection of the case after chambering should reveal something. The fact that it only does this after installing a bullet suggests that it is length or neck diameter related rather than sizing related.
How many firings on the case?
Are you loading at or near max? Compressed loads?
Is there a possibility that you have a carbon ring forming in your chamber that the case mouth is hitting?
Chances are good that everything will be fine, but it's certainly worth checking a few things before proceeding.