Limb to use- Upper or Lower?

[Rdutton]

Do any of you shoot super-imposed?  If so, why do you use it?

FB.

Fred,

I shot the cloud obscured Sun super-imposed yesterday at around UT 16:32 and then did a LL sight.

Both yielded good LOPs.  The super-imposed sight only needs a correction for refraction and I use the formula;

0.96 / Tan(Ha)

Shooting super-imposed is not a shot I often make using an AH. 

Why do I use it?  It's an easy sight.

Roland