my current 243 load uses h380 which I am now really struggling to get hold of. I have plenty of N140 that I use for my 308 load. Is n140 to fast for 100gn heads? I don't have any rfd's near by that stock vhit or hodgens. Has anyone used n140 with 100gn heads? I would prefer to stick with my current load as it shoots well but if I can't get h380 needs must.