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Cool, some initial thought would be:

Use or borrow a torque scredriver and make sure the action screws are done up correctly
Clamp a block to the front of the bench so you can push against it and...

northdude, some questions...

100yds / 100m ?
are you shooting factory or reloads ?
looks like quite a bit off a vertical to me, is the rifle in a plastic fantastic stock ?
shooting off a bipod...

TMK is the tipped version of the Match King.

Green tip. Both versions have the same shape. The MK is slightly more traditional shape compared to things like the Amax, ELDM and Bergers.

TMK ?

they worked for me, after trying the 75 Amax.

can send you some 62grainers to test if you like