Welcome to the forum, Hft novice, and an excellent first post.

The 57 is one of the few Weihrauchs that doesn't grace my collection. Must make amends. Due to the similarities of the internals with the 99 break barrel, and the fact that the pop-up breech will cost some efficiency, I'd certainly go along with the consensus that these will run much happier at more modest power levels, and would be de-tuning. Also, as mentioned, paying attention to the integrity of the seals, finish and lubrication needs of the port will pay dividends.