[Unclenick]

I would use the depth probe on the back of my caliper beam to see how high the Redding peep is off the receiver when zeroed at 100 yards now. Then I would move the sight down where I wanted it to be and measure the new height off the same spot on receiver. Subtract the old height from the new. Multiply that difference by (3600-Sight Radius in inches)/3600. That's how much the front sight will need to come down to keep the same POI. It'll be almost as big an amount.

Example:

Suppose the sight radius is 25" (I have no idea how short your barrel is, so I pulled that number out of thin air; you'll have to measure from the back of the front sight to the back of the peep to get your actual sight radius).

Further suppose the current zeroed peep hood height is 1" above the receiver and the desired position is 5/8" above the receiver, so the difference is 3/8" (0.375")

0.375 × (3600-25) / 3600 = 0.372". So that's how far the front sight needs to come down.