I shoot an handload a lot of varied .308. From my R700 26" Varmint bolt to 308 subsonic and for my M1A semi. A few questions, first what exactly is the barrel length and twist in your AR10 ? Secondly if I could offer some precision shooting tips moving forward, I strongly suggest ditching the snack table as a bench. You will get a lot if excessive movement and you will get rifle "bounce". You will gain far more rigidity shooting prone off a mat. Shooting bipod is a bit more challenging than shooting off a rest. With a bipod you want to "load" the bipod by gently forcing your shoulder into the buttstock. Many precision bipod shooters will loop straps from their shooting mat around the legs of the bipod to prevent movement. I shoot benchrest so I screw a piece of 1x3 strapping 20" long right to the wooden bench, then rest the bipod legs against the 1X3.