All three of my K-Hornets seem to thrive on 1680. Many years ago my first one loved the old Nosler 45gr Solid Base Hornet bullet, so I laid in a couple thousand. Still shooting them.
My Browning Low Wall in K-Hornet is used for sage rats here, and is good out to just over 250 yards. Other rifles get used after that yardage mark, 221FB and 20VT mostly, but that K-Hornet is just a hoot to carry and shoot in the rat patch. Quiet, zero recoil, light to carry and just plain fun.
Lil Gun will indeed give higher velocities, but as mentioned, pressure spikes turned me off. I'll take accuracy over speed any day.