I decided to changes thing a little as I had intended to lengthen the trigger when the two halves were welded back together as the bottom line of the stock is .185 deeper than ordinarily it would be with the standard bottom metal so I could have the mag capacity in the blind mag without compromising the strength of the remaining wood. There is about 3/16 left but this was making the wrist a little beefier than I like. It was near 6 inches in cicumference which is way to big for the style of rifle I envisage. The answer was to raise the trigger bow up so the trigger length would be standard and the wrist could be made much smaller and to do that I thought I would do the same as they do when an extended magazine is made. It can be subtle like this 350 Rigby mag which has been a real inspiration in many ways (credit to XAUSA for this one)

or this Hartmann & Weiss

or over the top like this one

I was thinking of the subtle end of the spectrum and set the trigger bow in an extra .185 which leaves the trigger length the same length and will preserves the stockwood thickness under the mag well.
Have it roughed into shape and was able to reduce the wrist circumference to 5 5/16 but should get down to under 5 inches when the finish shaping is done which will have to wait untill the barrel gets installed and the forestock shaped. This is how it sits for now.

Incidentally, the drop box magazine has been made by cutting the standard box and welding it further down the trigger bow face which may entail extending the top edges if too much drop is required. (If the available funds dont run to one of the expensive off the shelf units.)