I agree thats a B.S response. Not only have you just insulted a guy who probably just got into it, but you've made it likely that if he does have a question in the future he may not ask and just try it, possibly causing an accident. I've made almost the same mistake with some IMR/H 4198 when I first started reloading my .308.
I was excited, got the books, read them. (I'd bought the ABC's of reloading and the speer and hornady reloading manuals. ) Looked up the powder I'd wanted to use with my bullet weights, drove over an hour away to the closest place I could get powder.... And was then floored by all the choices I had. To make a long story short, I grabbed the wrong thing of powder and didn't realize it until I got home. When I said ah [beeep]? I ended up ordering some ViHT online and still have that bottle of H4198, one day I might get a rifle to use it in.
But if it wouldn't of been for an awesome set of guys on thefiringline, I might not of got into reloading. I've asked all sorts of stupid questions, like why my primers were not fitting into some military brass (military crimp) and why my primers kept having dimples in them when I used my priming tool (priming tool pin was up side down) I'm sure there's lots more I can't remember. But the point of these forums is to use your experience to help, not insult people so you feel superior.
There's my rant, now to the OP's question: while some H/IMR's powders do correlate, not all do. I'm currently using H4350 to work up a load in my 6.5 creedmoor. Often you can go to the manufactuer's website and they'll give you good load data. What caliber are you planning to reload and maybe someone can point you in the right direction for safe loads with your bullet selection/weight/and caliber.