However, for your interest, here are some loads we worked up during testing of the 350 grain SN RN and PP.
350gr RN 68 grains H4350 Federal 215 primer 2300 fps
" " 70 grains " " " " 2345 fps
" " 72 grains " " " " 2363 fps
" " 74 grains " " " " 2375 fps

350 grain PP 72 grains H4350 Federal 215 primer 2380 fps
" " " 73 grains " " " " 2250 fps

H414 is similar burning rate to H4350, so your 70 grains load should give about 2345 fps.

Regards,
Geoff McDonald.
WOODLEIGH BULLETS