From what I understood:
"After initial priming each metered spray delivers an average of 1.0 mg of butorphanol tartrate"
The nasal bottle is 2.5ml and has about 10mg per ml. The injectable kind comes in two strenghts of 1mg/ml and 2mg/ml. That means you would need much more than a few sprays but instead an entire bottle. So, no, you cant use the injectable for snorting, unless you feel like snorting alot of liquid.