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Doc and Joe are all over it.
Lose the bi-pods. They were designed for machine guns, not for precision shooting, not unless they are attached to a free floating stock. Even then they should be specialized bi-pods, make to take shock away from the weapon.
The internal ballistics can be affected if the rifle is fired while in contact with a "hard" surface (frozen ground, wood, rock, road, building, window ledge, table top, truck bed etc.). Contact coming from the surface, transmitted to the bi-pods, transmitted to the barrel, before the bullet has left the barrel, you get the picture.
Could also be you changed your body position when shooting off the ruck. Could be due to a number of reasons, stock weld/spot weld might also have changed when you went from a bi-pod position to a ruck position.
Mr. Long-range and Mr Econ are the heat here as far as long rifles go. I’m sure they might offer more in the way of opinions.
TS
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