Re: Bipod length?
I use 6-9.untill I hit high grass.
Do some research on your own,
Get a tape measure and take it with you, then grab some books or a 'make shift rest' (some ranges let you borrow a 3 sided multi height gun rest).
Use it and measure what you like. I perfer mine to go lower so im lookinh to the atlas for the leg tilt feature.