POI/POA CHANGE

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  • Last Post 05 June 2022
joeb33050 posted this 05 June 2022

Commonly, as the rifle is moved to change the Point of Aim, POA, the relative Point of Impact, POI, changes.

This effect is caused by variation of location/pressure of the bags on the stock, as the rifle is fired.

It’s the bags.

 

My rifle solution:

 

The front 2 Hoppes rest screws go in the space between bench top boards. The rear Hoppes screw adjusts elevation. The top of the Hoppes rest with bag is free to rotate.

The rear rest board screw goes in the space between bench top boards, and rear rest swivels about the screw, adjusting windage.

 My Ruger Charger/M10 Savage solution.

 

 

  

The acorn nut goes in a hole in the rest top before firing.

 

These setups eliminate the POA/POI change, and are the product of about 15 years of testing.

I never could get a sled or “V” front to solve the problem.

 

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joeb33050 posted this 05 June 2022

 

 

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joeb33050 posted this 05 June 2022

Guns etc. are kept in A/C indoors~ 76 degrees. At the range the POI moves up, ~ 1/2" @ 50 yds, as rf rifle and ammo warm up to >90 degrees. This effect is reliable.

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lotech posted this 05 June 2022

I used the Hoppe's rest straight-out-of-the-box years ago and found it just didn't work well and was much too light to stay in place, so I bought a Hart pedestal rest. Very heavy and it doesn't move. However, your modifications to the Hoppe's may work just as well. Good idea- 

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