For those of you who, after long practice, still are having difficulty keeping snuff from hitting the back of your throat, or who (like me) have overly sensitive sinuses that react to every pinch (big or small) with a disproportionate gush of goo, I thought I'd share a technique that has served me extremely well.
This is directed at those of you who, in spite of the best efforts of the many veterans on this site, simply can't get the right amount of pressure when you sniff. You find yourselves in the frustrating position of loving the habit when you get it right but, because your technique is unreliable, hating it when you get it wrong.
The following is a variation on the stuffing technique but, I think, is tidier and less wasteful. Plugging maybe is the better term. While I've found that it works with all grinds of snuff, it is worth noting that the bulk of my intake is Black Rappee. Indeed, plugging seems to work best with the coarser snuffs.
1) Take your pinch--a healthy-sized one, as is often recommended here--and trim off the excess with your middle finger. That is: brush away all the bits that are not gripped between thumb and forefinger.
2) Bring the plug right up to your nose so that your index finger is touching the nostril.
3) Slide your index finger gently off the plug, and bring the flat of your thumb (with your plug on it) flush against the nostril. Mind that you don't actually stick your thumb up your nose. You just want to position it such that you've created a seal between thumb and nostril.
4) Now breathe in through the other nostril. Strength can vary, but I'll take a strong (not straining though) breath. Do this a couple of times, making sure to exhale through your free nostril as well.
5) When you remove your thumb you will find that most if not all of your plug is now in your nose. Before I take my thumb away I'll give it a couple of twists (while breathing in) so as to get as much of anything remaining. Again, resist actually sticking your thumb up there.
6) Be sure then to give the nostril a pinch and repeat on the other side.
This method isn't perfect, and expect some crumbs to still drop out of your nose. However I find that the indirect intake of air (as well as the exhalation, which infuses the snuff with some of the moisture from your breath) works extremely effectively in getting the snuff quickly into the front of your nose, not up into your sinuses or to the back of your throat. The drawback is that your nose can get quite full up and you'll need to purge every so often simply to make room for more. (Though you'll be amazed how much you can get in there.)
As I say, I find this to work really well with rappees, but it's also excellent for people too sensitive to really fine snuffs (like Quit); after step 6, just exhale through your nose to blow away any of the excess that would otherwise fly to the back of your throat.
Also, while it may not seem so at first, I find plugging a slightly subtler way of taking snuff in public. It takes a little more time (but we're talking seconds here), is less dainty and even less graphic.