First thing first- If this is a gripe about the rifle not meeting the guarantee, contact TC, give them a chance to fix the problem, then post about it.
If this is simply trying to figure out how to get the rifle to shoot better, edit your original post to reflect that intent.
Second, go through and the rifle a check up. I am not familiar with the details of a TC Venture, but there are some items to check common to all bolt actions.
Inspect the condition of the bore and crown.
Remove the stock from the action and check the bedding. Make sure the action fits in the stock with no binding. Check to see if the bedding is bending the action when the action screws are torqued. Check the forearm for sideways pressure, too much upward pressure or uneven pressure. When re-assembling, torque evenly and to the proper value.
Disassemble the scope rings & mounts. Clean & degrease them. Check that the mount holes are correctly aligned. Check that the mounts sit on the action correctly. Use the proper torque value when reinstalling. Inspect the fit of the rings to the mounts. Make sure they align correctly when installed, both left & right & vertically. Use an alignment tool. Again, use the proper torque value.
Clean and degrease the scope. Center the crosshairs both in windage and elevation. Inspect for damage. Install scope, use proper torque values. If using Redfield style rings & mounts, adjust windage using the two screws holding the rear ring in place. This can be done either with a bore sighter or by shooting on target. Once it's close only minor windage corrections will be needed from the scope.
Until these items are checked and any corrections made, it's futile to check the accuracy of the rifle
