No4 mk2 going awol.

[ssj]

So I went shooting today, practicing for the Dick Travis VC shoot next weekend. I have been chasing an issue with the No4 for a while. It shoots the first 3~5 shots very well, vertical dispersion is under well Under 2MOA, horizontal about 2 MOA. On the next shot it throws 6MOA high and then shoots the next 4 or so up there (but a little more dispersed). The next 4 are not grouped terribly well at all.

So what I have done so far is I found the stock had bananna'd a wee bit and there was a gap under the receiver. So placed a 30thou wood shim the length of the bottom of the receiver and epoxyed it into the well. Now when the main screw is done up tight you can see the imprint of the receiver the length of the wood and even maybe imprinted 5 thou into the wood. The draws seem tight, you have to lightly hammer the end of the forestock into the wedge so that seems tight. The re-inforce of the barrel bed seems tight, front bed OK.

So frankly I am stumped.

Does this symptom suggest what I should to look at to you?

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