yes, shotshells are measured after they're fired ...so if in fact, that is the spec on your gun ...you should be ok ...at least in theory .../ but its not just a chamber length issue.
and I won't pretend to know much about an old spencer shotgun ....but I'd be surprised if it does not have damascus barrels ..and Damascus barrels were never designed to be shot with modern smokeless powder shells. So depending on what these shells are - no, you can't fire this gun....
You might be able to shoot black powder in the gun ...but at the very least, the gun needs to be checked by a competent gunsmith even before you do that .../ reconditioned does not tell me the gun is safe to be fired...and noone on the internet, is going to tell you its ok to shoot this gun !!! You need to go and see a good and reputable gunsmith that knows these old guns ...not some back yard wannabe .../ and looking at it may not be enough - it may have to be pressure tested .../ so I keep coming back to no, do not fire these shells or any shells in this gun - regardless of shell and chamber length....
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