Well I've always used 4" as a minimum for my buries. I'm about 160lbs and that has never failed for me. I've made a hammock for a friend who is about 195-200lbs and made the continuous loops exactly the same and they've held just fine for him too. On whoopie slings I use a 4" burry at the fixed loop end, and 10" for the main bury. I dont know if there are specs from Samson rope on bury vs weight capacity, this is just what I've found from experience. If you were a bigger guy you could make them longer just in case, but what I use should be just fine for you.
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