For hash oil i'd use butane. Sounds scary rofl, but the butane evapourates almost instantly and your only left with the sticky honey oil.

But making hash is more fun imo. And you'll get something thats easier to roll/use.

You should be looking for about 10-15, maybe even 20% to come though, it will differ though from strain to strain and what your using. [bud/trimmings]