My rig- Rem 700 LSS 300RUM, Burris Fullfield II ballistic plex, Harris bipod. When sighting the rifle in with factory 180gr Swift Sciroccos, I was 2.5-3" high at 100yds, and was hitting the 400yd gong with minimal holdover (second hash mark down from main crosshairs on B-plex), and 500yds no problem (third hash mark). That was shooting off of a bench, with a hard rest, and then from a bipod. I know that hard surfaces cause a rifle to jump and POI to shift a little higher, but I didn't think that a bipod would have an effect. Last day of season, I was shooting at a mule deer doe at ~400yds (at the moment, I can't remember what she lasered at) and so I held high in the vitals but was still hitting low. WAY LOW! When I eventually got one (a different one at no more than 350yds) I hit low in the brisket on a quartering towards me shot and disemboweled the deer. Not a pretty sight. I was shooting at both of these deer with a soft rest (left my bipod at home) and hit low every time. Aside from temperature affecting the ballistics of the rounds, the only thing I can think of is that my shooting off of a soft rest vs. a bipod made my POI shift lower. My question is this, Would fully floating the barrel remove the POI shift since it would allow the barrel to fluctuate naturally instead of having the contact point with the stock (and subsequently the rest/bipod, etc)? Or do I need to leave the bipod on all the time to get the same groups? This concerns me greatly since I had been consistent all summer long and all season long up until this point. And I was absolutely sure of my hold and my trigger pull. I've never experienced anything like this, and it's the only thing I can think would affect my POI, because I don't think the factory rounds would be THAT sensitive to temp.