Q&A: Sweden's power depended on the scale of comparison

Was Sweden a major power or a medium power during this period?

It was a major power within Europe but only a middle power when measured on a global scale.

Sweden's classification changes with the geographic scale. It could humble important opponents and still counted as a major power within Europe. Its influence and operations did not extend around the world on the scale of Britain or France. It was therefore a European major power but a middle power in a global comparison.