That 3400 fps sounds way too optimistic to me. I went up to 98 gr RL25 with the 225 gr TTSX and had to trash the brass after 2 loadings because the pockets wouldn't hold primers anymore. Shot pretty good
I have since backed down to 94 gr since 96 gr gave me a few extractor groove marks on the case heads. It still shoots lights out and gets close to the same velocity.