As far as whether caffiene is active via the snorted route...yes, I believe so. I've never done it, but I've read reports of it.. Grounds, as other people have said...bad idea for snorting, but pure caffeine wouldn't be bad, health wise. Even caffeine pills wouldn't be as bad as grounds. Binders aren't good on a health standpoint...but better than grounds. As far as effects go...they would probably be the same as drinking it. You'd probably need a smaller dose and it would have a shorter duration, but they would be the same effects... Not fun, IMO. I like some coffee, sometimes, if I don't have a better stimulant... overall, caffeine sucks.
OP, what did you snort to get effects similar to coke? Was it Ritalin or were you just using that as a comparison? If you have Ritalin, just use that. I've never done it, but I know about it and its effects would certainly be better than caffeine. I've used adderall, and that is WAY better than caffeine. As a side note, it is about twice as potent plugged, so if you're looking to snort things, for the lesser amount that is required...plugging is even better. But that's amphetamines, and Ritalin is different. I would assume that you could get stronger effects from plugging it, but I'm not sure, so research that more if you are interested.
Just thought I'd try to be of help
Don't feel bad, I tried smoking grounds back when I was just starting to desire "highs". For the record, it didn't work. Lol
Caffeine could possibly be more potent plugged, as others have asked about it... but it would likely also be the same shitty effects, therefore I wouldn't recommend it, especially because caffeine is cheap. There isn't much of a point in trying to preserve it...
Whatever you do, be safe and have fun. When it comes to caffeine, if you use it, try to have fun, because it isn't fun IMO.