Zero Shifting weirdly

[smeredit06]

UPDATE :
I'm an idiot. After deciding to take it out of the chassis. I discovered my Pic rail was loose (like screws can be taken out by fingers loose). Guess I was suprised it was something like that as the rifle shot great all day today besides poi shift (took out to 1000yds still shooting .5 moa groups). Will take back out to re-zero tomorrow. Thanks for your opinions!


Hey All. Have a Tikka T3 in a MDT HNT26. Zereod last month. Shot a match. Was dialed in for everything. Then took it out of the chassis to clean the mud off of it. After putting it back together, my Zero shifted about 3-3.5 inches. Is this normal? I figured it would shift some (maybe an inch) but not that much.

The rifle is shooting consistent and seems to be sitting the chassis perfectly. Torque to the same spec, same ammo. Nothing changed besides taking it out of the chassis

 

[alexnelon]

Yes that’s pretty typical.

 

[smeredit06]

Yes that’s pretty typical.

Ok. Thanks! I just figured it wouldn't shift to that extent

 

[Jake Larsen]

Gotta bed those and not touch them for best results.


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[Lawnboi]

That’s a big shift. I normally see a tenth of a mil or 2 not inches

 

[smeredit06]

That’s a big shift. I normally see a tenth of a mil or 2 not inches

I agree. Just not sure what could be. Checked everything

 

[Deadwood]

Not uncommon. Stress Bedding helps some.
Also…. When reassembling, make sure you position the rifle vertically resting on the buttpad. Helps ensure the recoil lug is firmly setting in the same place each time, and where the natural recoil wants to set it during the shot.

 

[Hondo64d]

Hey All. Have a Tikka T3 in a MDT HNT26. Zereod last month. Shot a match. Was dialed in for everything. Then took it out of the chassis to clean the mud off of it. After putting it back together, my Zero shifted about 3-3.5 inches. Is this normal? I figured it would shift some (maybe an inch) but not that much.

The rifle is shooting consistent and seems to be sitting the chassis perfectly. Torque to the same spec, same ammo. Nothing changed besides taking it out of the chassis

That is a bunch of shift from just removing a barreled action from a chassis and reinstalling. I don’t think I’ve observed more than a .1mil change when doing this same in an unbedded MDT chassis. In my bedded stocks, often there is NO shift. Even when removing a scope from the rail and reinstalling it, I don’t recall ever seeing more than a .2 mil shift.

You might reinstall barreled action into the chassis and loosen either action screw while lightly holding barreled action with your fingers to detect movement. Any significant movement would indicate a bedding issue, which I suppose could be the source of your problems.

John

 

[smeredit06]

That is a bunch of shift from just removing a barreled action from a chassis and reinstalling. I don’t think I’ve observed more than a .1mil change when doing this same in an unbedded MDT chassis. In my bedded stocks, often there is NO shift. Even when removing a scope from the rail and reinstalling it, I don’t recall ever seeing more than a .2 mil shift.

You might reinstall barreled action into the chassis and loosen either action screw while lightly holding barreled action with your fingers to detect movement. Any significant movement would indicate a bedding issue, which I suppose could be the source of your problems.

John

Update posted!