Bipod changed my POI

Bullmark

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Roanoke Va
So I wanted to get some takes on my dilemma.
I'm a long time hunter but new to the long range space. I just bought my first bipod, an Atlas V8 I believe.
I took it to my lease and realized I was gonna hafta shoot from a prone position, which is not something I've done much.
I was shooting 2 different rifles, both very accurate off the bench.....always .5moa but usually less if I do my part.
Rifle #1 is a 6.5prc shooting hand loaded rounds. At a range of 205 yds, I shot 2 diff 3-shot groups and both groups were right on the money and inside of 1".
Rifle #2 was a different story. It's a custom .280ai also shooting hand loads and from the bench it's the most consistent shooter I've ever owned. I used the same "technique" with both rifles and felt like I squeezed off some good shots. But my POI was a good 3" low and 1.5" right. I have that rifle zeroed at 100yds, don't ask me why, but i dialed the 5 or 6 clicks to bring it up at that distance.
Both 3-shot groups were low and right, plus they were not great groups. This rifle is always .5 MOA and most of the time better. These groups were 2.5" groups.....at 205 yds. I checked my scope and it's rock solid, nothing loose.
Had I not shot such nice groups with Rifle #1, I would think it was me and my lack of experience both shooting prone and off a bipod.
I saw a Gunwerks video where the shooter said, in no uncertain terms, that some rifles would shift their POI from a bipod, while others may not.
I'm going to take it to the indoor range and shoot off sand bags and see what happens.
The POI shift is easy to fix.....but the grouping issue is altogether different.
What do you guys think???
Not that it matters, but Rifle #1 has a proof carbon barrel and #2 a Bartlein SS. Rifle #2 is supposed to be my deer size game option out to 450-500, but with groups that loose, I couldn't take that long of a shot.
Somebody throw me a lifeline.....thanks.
 
Assuming your barrel is fully free floating, with the rifle resting on the bipod and the butt up supported in a shooting position on say a sand bag dose the barrel touch the stock because of the shift in support position. Also something I'm guilty of are you pulling on the grip differently due to the change of shooting position?
 
On rifle #2 when the POI was 3" low and 1.5" right, was that after you dialed 5 or 6 clicks?

Some people can shoot amazing small groups from prone off a bipod. I'm not one of them. My group sizes double, or a little more.

I have experienced about a half moa drop in elevation when shooting from a bipod when compared to shooting off a bench.
 
Frankly, it could be a lot of things. There's several similar threads on here typically with several pages of suggestions/solutions. I'll go through a few of these but solutions to these types of problems are all posted out there…

First, playing the devils advocate, have you previously shot your 280AI at 205 yards? What scope are you using? Was your parallax adjusted? Did you have symmetric "scope shadow" all the way around your sight Have you checked your tracking on your scope? Are your rifles identical in setup or are they put together from different components, have different scopes, etc? How hard were you loading your bipod? Is it free floated and how much clearance do you have around your barrel? What's your trigger pull weight? Is the group more vertical or horizontal?

Since you don't shoot from the prone there are POI shifts that occur when changing positions. How do you shoot from a bench? I kick the chair away and stand behind my rifle and build a "modified prone" type situation. A lot of people simply sit next to their rifle, which definitely can cause POI variation. How are you lined up behind your rifle? Square or canted off to the side? Are you using a rear bag?

When was the last time you cleaned your rifle? Especially cleaned out the carbon? Has your load in that rifle shot better than 1.5 MOA at 205 yards before? A lot of loads shoot well at 100, but not further.

Etc
 
Also, did you stop, dial back to your zero and shoot it at 100 yards again to see if it/you could still shoot 1/2 MOA? Did the POA/POI shift back to your 100 yard zero? Did your previous 100 yard zero have any offset?
 
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