Jaco,stug and sixtyten are correct.
Jaco because he already does it this way, stug because he understands the forces acting on the action by the action screws,and sixtyten because you need clearance in parallel sections to stop pinching.
The reason I wanted to only bed the action and not the Knox was that I wanted to be able to change caliber barrels using the same action and keep a completely free floating barrel whilst maintaining the best possible action to stock relationship.for accuracy of course.p
As to why you need to bed the Knox, in my opinion, is that the front action screw tends to pull the recoil lug down and needs support both in front or behind, just as stug said.almost equally can be said for the tang.
Every action to barrel to stock combination is different, so we really need to think about the mechanics of each situation.
Nathan foster has detailed instructions on tikka bedding in his book on accurising rifles.also on the the net.
As a side note. Pig hunting around Wilcannia paradise.
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