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FWIW I do check loaded rounds through the action. Not always, but if I've changed anything or when they absolutely need to function. If you don't know how to do that safely you probably shouldn't have a firearm.
On occasion I do this as well. No danger to anyone including myself when done properly.
From time to time I get a hard chambering handload at the range. Since COLs are the same as those that chamber easily, the problem the shoulder did not get pushed back during reloading - likely due to short stroking the press. (I only FL size.)
