Your dead right there Mitch.
I do practice and shoot open/ off hand and with walls/ trees/ support ( legs straight) I pretty much match the posted.
My knees are gone mate, " roofing & women for 40 years "
I can match the posted with straight legs but it`s impossible for me to get down anymore and use my knees sadly.
atb
You with your knees Mark, I with my hands and arms, any more takers out there.