Re: base height
Sloped bases will often present cheekweld/height problems.
My approach is to build a custom slope into the regular unsloped base. This method takes into account the actual relationship between the boreline and the particular scope's elevation adjustment mechanism.
Zero the rifle at 100yd, then run the elevation down to bottom and come back up around 3-5MOA. Using a small aimpoint at the top of a target, fire several shots, and plot the distance back up to the 100yd zero.
Now the math.
There are 3600 inches in 100yd. Measure the length of the base and divide that number by 3600. If it's, say, 4 inches, the result will be .0011111, etc.
So, speaking in rough terms, if the bullet impacts 20 inches below the aimpoint, the rear of the base will need to be raised .020" in order to bring the POI and POA back into correlation. Glass or Epoxy Bed the base to the receiver with .020" of shim beneath the very rear edge of the base, and now the base is custom configured to provide the perfect degree of slope to permit the maximum amount of available elevation adjustment.
Be sure to apply release agent to the contact area on the top of the receiver and around it for some small distance.
The advantages to this approach are several.
The slope is custom matched to the scope's capabilities.
Standard unsloped bases are a lot more available.
It's kinda unlikely that raising the scope's eyepiece by the required number of thousandths is going to cause any new and serious cheekweld problems.
Greg