Nice rifle, looks like you were having problems with your photobucket or something. I don't use the 250gr. sierra's in my 375, but imagine they would work great. For chits and giggles take a look at this thread:
https://www.24hourcampfire.com/ubbth...53856/all/375_250gr_Sierra_Gameking_expaI've used the 250gr. gamekings in my 338 win mag on elk and they perform very well. One made a complete pass thru both shoulders and although the core separated from the jacket, it still passed thru the far side shoulder and kept going. The jacket, however, was found on the farside when we were skinning the bull out. I like the sierra's and will definitely keep using them. Nice rifle too, by the way..