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After habitual FTF problems with my Kimber, my gunsmith detected a tight chamber and suggested reaming it. I said okay, and now the gun is dependable. The problem is that it seems my old load data are off by a meaningful amount (lower).

Should there be a relationship between reamed chambers & reduced velocities?
 

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"BUT NOT ALWAYS..."

Tight chambers allow the gasket (your case) to form a better seal, alowing higher velocity.

As always, gotta test.
 

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I'd think it more likely that you have something else going on. Like a difference in a component from the old batch of ammo to the new batch, or there were different lighting conditions for the chronograph. I've seen up to almost 200 fps difference caused by differences like I mentioned.

Until you go to the trouble to use all matching brass from the same lot, accurately weighed powder and sorted by weight bullets, you just have to accept a range of error that can drive you crazy. Lighting inconsistencies can cause as much grief.
Good Luck, but I don't think your low velocities are a result of a re-reamed chamber.
 
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