It’s really strain dependant in my experience, just like others have posted.
I’ve had super frosty not dense bud constantly yield less than 10%. I figure they are better to make bubble hash out of instead of flower rosin.
You just have to test each strain but make sure moisture level is between 55-65% for best results.
I’ve had a couple strains that are real dense and frosty that I thought would yield good but only got like 10-15%.
My Twinkle tarts isn’t the densest bud or frostiest but it consistently gets me 25% rosin on cured flower
And my sundae driver is pretty dense and i can get 25% if conditions are right.

