Dearest BJ, and, of course, you too, sweet Spitzer,
Sorry I was abrupt. I thought this was a real situation. Something like this topic might be better suited to Think Tank so as to not confuse newbies into taking radical action...
That said, I did use R on Giz years ago, so have some experience with it. It is not something I would encourage using. Why? Because, while initially it did seem to do the trick (0.5 U) and bring her numbers down, it's such a short acting insulin, she'd immediately (usually within an hour or two) be right back up where she was.
So, basically, what did using R accomplish? It dropped her like a bomb and shot her right back up like a rocket. Couldn't have been pleasant...
There's a reason why R should only be used by vets. In an emergency. And, in a controlled setting, usually accompanied by IV fluids.
The day I was going to do my first curve on Giz, I was pretty sure I got a fur shot. Her reading at +2 of 500 on the nose confirmed it. Skipped the curve, put a couple of drops of Rescue Remedy on her ears because she was cranky, and rode it out. Can't remember her next PS, but seem to recall 480s...
Well, that's my humble experience and thoughts...
Love and please don't give me/us a speculative heart gasp again kind of hugs,
Deb and Nikki -- and, Giz, forever dancing in my heart...
PS: Or just somehow put it in your title, okay?