How much fits into a joint roller?

Alright, so here in a day or two I'm going to be experimenting with eating weed... using Pride's firecracker recipe again. However, I want to be able to measure out what I'm using, since I can't eye things worth a shit (Any alternatives to measuring bud will be gladly welcome).

So, if anyone has a scale and a roller on them, can you tell me how much fits into a standard (78 mm) joint roller when packed full? Thanks in advance for any help.

You can try a really shitty innacurate method. Take a standard office paper clip. Which weighs about 1 gram. Then level it in you're hands. hahaha sorry. I'm not shure.

Hmm... maybe I could make a crude scale to measure bud against paper clips... OK maybe not <<' I tried. Thanks anyways.