For those of you thinking to upgrade your front rest or front rest sand bags, you might want to consider a JJ Industries front shooting rest made by John Loh.
Some may think of getting a coaxial rest (joystick), but this is a conventional elevation/windage rest with screws. It comes with an Edgewood bag too.
It is precision-made machinery and so so smooth. The screws glide and when it stops, it stays put. Everything is stainless steel, aluminum base, and delrin top frame.
The windage adjustment runs on a long screw and the whole top (including the middle tower) moves, runnning on 2 S/S horizontal rods. This is why the
windage stays true and straight on a horizontal plane.
The elevation adjustment is via a mariner's wheel for coarse adjustment and a rear solid-brass knob for fine elevation adjustment.
I got an extra top assembly so that I can put a narrow bag on to shoot rifles with sporter stocks which are less that 3" wide.
It even has a bubble level built into the rest, as well as a delrin bag block with another bubble level, to make sure the front bag itself is level (and not only the base).
A little pricey, but "buy once, cry once" was probably meant for this rest.