IMHO, I don't think that's going to give you a consistent grouping. Only because the front forend isn't sitting on something solid. I believe that during your shooting "string", your forend can shift...or perhaps your scope will touch the "V" notch. Too may variables can come into play during a session that you will need to pay attention to other than just loading, your position on the rifle, and aiming.

Personally, I would screw a piece of wood, with a glued felt or glued piece of leather, across the front of your "V" so that the rifle has something solid to rest upon. I think that would take a lot of variable's out of the equation. And I can't tell from the picture....but if you have the same "V" in the back, I would do the same thing.

Duct tape is a good thing. Never let anyone tell you different!! I've seen guys with $3,000 shotguns show up at a trap range with a cheek weld "adjustment" using duct tape and whatever under it to make it work!!!

Dave