I just recently loaded my 338 RUM 3008 FPS with the 250 Serria BT. Will shoot theses as soon as I get my Break back. I had these loaded to 3150 fps then I contacted Serria they said with the powder I was using 100grs of puts the psi to high. So I down loaded these rounds to 95gr and now the psi is ok. I'd rather be safe then sorry. I can load the RUM to 3150 with a different powder but not this powder.