Mr. Wright,
Some questions here...
At what date you would be in Kelbly's range?...I will be there on May 18 in the morning, btw.
Can you arrange to bring the rifle there, or just other rifle with similar weight & fore end width?
If so, I can probably prepare 6" wide front bag and we can try to shoot the rifle with my rest, just the day before the SS, or in the afternoon after the match?
It would be just the standard rest, and I would only need to modify the rest top a bit. (just like what I did in Brisbane last 2006 when I shoot for the "500m fly shoot" using Stuart Elliot's Heavy Gun 55 lbs...his HG also has 6" fore end).
Maybe we can get ideas etc from this experiment and then find better solutions?
Well, I might need to know the width of the buttstock too, and prepare the rear bag.
I will attach a photo here for you for your reference....
You can see the "modifications" in the photo...I only removed the side tension plates of the rest top and put an alumunium plate onto the existing base top. (personally I don't think side tension is needed for a heavy gun with extra wide foreend...but I might be wrong!).
I covered the additonal alum plate with tapes (just to avoid marr).
Also use the joystick so that the rest top and the joystick move in the opposite direction. (joystick up - reticle moves down, joystick to the right- reticle to the left, etc).
It work for me, and I prefer to use my rest that way. (it's less effort to operate the stick, just like playing billiard...you are able to operate the joystick just with one or two fingers even there's heavy weight on the rest top).
Oh, I almost forgot to mention that the tension screws were just set in "normal" setting. I still had to hold the joystick, of course. (reason: it's hard/sticky to move the joystick if I set the tension tightly).
Paul & I discussing about to use counter balanced weight to compensate the weight of the rifle.....we would probably need some experiments to make one as to your expectation.
We consider this is an interesting project.
Sorry it took long to get back to you......seb.