Impact shift from stock replacement

[Tinybear]

Took ou my CZ 457 Thumbhole laminate this weekend. Had just swapped it into a MDT ORYX Chassis.

Found the rifle was impacting 4 or 5 mils low at 25 yards after swapping.

I expected a small change in impact (hence starting at 25 yards). but was shocked by such a large jump. Especially since both stock and chassis are very free floated. Scope was not touched.

Curious on the reason for this as it not making any sense to me. Rifle shot GREAT rest of day just a massive initial impact shift

 

[Buck1950]

Was this due to the diff in pillars for the actions screws? I'd guess the chassis is 'more secure' ?

 

[Lodi]

Different fit, different stresses, comb height and parallax, or could be a combination of factors.

 

[OkayShooter]

Likely the bedding putting more pressure on the barrel, then with the wood stock

 

[Back Country Hunter]

Took ou my CZ 457 Thumbhole laminate this weekend. Had just swapped it into a MDT ORYX Chassis.

Found the rifle was impacting 4 or 5 mils low at 25 yards after swapping.

I expected a small change in impact (hence starting at 25 yards). but was shocked by such a large jump. Especially since both stock and chassis are very free floated. Scope was not touched.

Curious on the reason for this as it not making any sense to me. Rifle shot GREAT rest of day just a massive initial impact shift

I would check to be sure the "recoil lug" is seated properly and not causing the action to sit crooked in the chassis.

 

[Bfranklin]

4-5 mils low at 25 yds would lead me to think there is something seriously wrong. That is a massive POI change.

 

[furyHD1080p]

check if you put the recoil lug on. Otherwise. play around with the torque of the action screw, the torque on the action screw will change the barrel harmonics, acting like a tuner.

 

[Tinybear]

Checked it all over removed stock rechecked All hood the lug is in correctly.

Impact point is remaining at the new location while in chassis. Haven’t placed back into the wood at this point to recheck.

 

[furyHD1080p]

Checked it all over removed stock rechecked All hood the lug is in correctly.

Impact point is remaining at the new location while in chassis. Haven’t placed back into the wood at this point to recheck.

At the end of day, if the impact is consistent. I won't Worry too much.

 

[tigrr]

Simply the torque on the stock screws changed and the point of impact changed. Adjust and if it is still impacting in tolerable groups be happy. If not go back to original.