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Cases from different manufacturers, and even different lots from the same manufacturer can vary in the internal size. I imagine there is some difference in brass and nickly cases as well. Change the interior volume, and you change the burn characteristics of a given powder. So, assuming everything else was the same (check your powder measure, and insure you are using the same lot of primes), it's very possible it's the change in cases. Then again, I've had bad days and thought it was a given load that worked wel before, and amazingly worked well the next time. Can you chrono both loads?
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I always thought that only the 'bottleneck' type cases were vulnerable to the more 'subtle' effects like case variation, temperature, etc., but experience has taught me otherwise over the years.
Of course the BIGGEST variability always seems to be my shooting technique, or my varying ability to make sure some scope-mount screw or other hasn't somehow been loosened by the Gun-Safe Gremlins. They do all kinds of stuff you have to watch out for...
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Case thickness can certainly affect pressure just as difference in the flash holes can affect things. While it might make a huge difference to a benchrest shooter, I wouldn't have thought different cases would make that much of a visible difference in accuracy for you. You may have just been having a bad day or it could have been a number of variables as the others have pointed out.
What 20cows said. Anytime you change ANY component, you need to work up your load data again. Even if accuracy is not compromised, POI can be. And in an accuracy game what might have kept edge hits as still hits, are now misses.
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