I dont think it is a rifle fault, as you described moving the target over ....you are almost on the right track here, I think the targets need to be the other way around.
I would try posting on one of the US forums they may be able to give you better info. These ideas of bending with a bull bar are just a little too erratic for the accuracy you want to achieve.
Gibo has the right approach with a more technical bit of kit though.
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