I just started reloading and I could use a little help. I am working up some test loads for my CZ550 American 6.5x55. I am using 140 gr Hornady SST's, Norma brass, and Fed 215 primers. I meant to get some IMR 4350 but picked up H4350 by mistake. I have read that I can interchange these, is that correct? Next question: The Hornady 7th edition manual lists a max load of 41.4 gr of IMR 4350. This is a reduced load for the old military actions. I plan on working up slowly starting out at about 38.5 gr, but I am just wondering how far past the listed data some of you guys would go. Thank you for any help.