Are you sure that your shotgun isn't chambered for 32 gauge shotshells?
I can't imagine any reason why the .45-70 would have been common in Spain in the 1930s, but I do know that 24, 32, and other oddball European gauges were still being made in a number of countries at that time.
Dimensionally the .45-70 and the 32 gauge are pretty similar.
There are also several other possible cartridges that it could be.
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