clearanceman.going this week to the range with the 54cal. and I am going to try 333 grain harvester solid sabot.yes to your question pyrodex select is corrosive.but on the other hand they say the triple 777 is also.have you had any problems with removing the nipple fron your gun when using the triple 777.some guy who have use the 777 say so.and thanks for that offer on the barnes bullet .