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only pushed them up enough in the sizer to index it
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I strongly suspect that's your issue right there; most likely you only partially-sized the brass and the 'web' of the case is still too wide to enter the chamber freely. Try measuring the case diameter with a pair of calipers or micrometer & compare to the factory round to be sure.
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Is it possible to run the completed rounds thru the sizer again
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Most likely not if you've already seated the bullet. (For straight-walled/rimless cases I've read that the
Lee "Bulge Buster" kit can be used like that, but I don't believe there is any such tool for the .38 as it's rimmed)
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Or did the bullets expand the shell
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Possible; you'd have to measure the case diameter prior to seating the bullet, & again after seating, & compare the two values to really know for sure if that's the case.
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is it possible to fire them as is?
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Probably, although I'd be leery of doing so if the fit is
too tight.
Ultimately the question is always:
Is a few hours of time spent pulling down & re-doing these bullets more important than the potential physical damage to your firearm, yourself & anyone who happens to be near you at the range if the worst case scenario does happen?
I'd probably try shooting a round or two (assuming you can chamber them without too much difficulty) & re-assess after that; most likely any that you can chamber will shoot OK, but I'd set aside & pull down any that won't chamber without forcing them. Chances are they'll be fine & you just need to take more care with sizing fully next time.
[EDIT] On a side note, this could also be a lesson in testing proper case/bullet fit in your firearm BEFORE loading up a bunch... It doesn't take many instances of pulling 100+ rounds to make you truly appreciate that!
