There are exactly 102.7 cones on average per oz. of my hops
That's just the cascade, and we had a great growing season here. Last year it was 14 cones lower. Hallertau is 197 cones per oz.
You get the point. There is no "cones per oz." count. You have to dry and wiegh them to know for sure. There are so many variables between cone size, variety, moisture left with how you dry them, etc.....
I use a $5 triple beam balance (please no comments, I bought it last year when I started getting serious about my hops) that I got at a garage sale for my weights. So easy and it doesn't lie!