Back with the German vessels it has been said:
... Bismarck fired main armament in mid-October , March and April. Prince of Wales fired in March, April and May 1941. Bismarck fired full charge in March and April 1941 (allthough the log says sub-caliber again).
The Baron, page 59 in my edition says of the period in second half November 1940, "Full calibre firing! Unforgettable was the day the Bismarck's heavy guns fired their first salvo. How far, how violently would the recoil cause the ship to heel over................a few loose objects came adrift, a few light bulbs shattered.......... Of course the concussion had already been felt throughout the ship."
Siegfried Breyer and Miraslaw Skwiot's German capital ships says "From the beginning of October the Bismarck conducted an intensive programme of sea trials and and combat training off Gotenhafen". and further "During the main armament and AA gunnery trials the superstructure, air conditioning system and the hangar door were damaged so severely that it could not be made good in Gotenhafen. In addition the fitting-out, still incomplete, had to be finished." Describing this damage caused by blast suggests there was extensive full calibre firing in November 1940 using the two main rangefinders installed at this stage.
Bismarck had months of training in the safe waters of the Baltic, before and after Christmas, far from threats of submarine whereas every time PoW left the safety of Scapa Flow she was vulnerable.
It is notable from the KTB that the training program is a casual affair, at Christmas even Lindemann took leave. After Christmas with the ship anchored or moored most nights, in March, April and May the Baron and others overnight leave. It is no wonder informed authors have characterized Bismarck as being at the peak of her efficiency.
All the best