This is my setup. Daystate Regal XL with a Hawke Vantage 4-12X50 AO sighted in at 40 yards on 6X for squirrels. I don't go any higher than 6X when squirrel hunting to give me a good field of view to find them in the scope. Most my shots are around 40yds, but I've had quite a few that were 15yds and less. Grabbing the front bell with my right hand to focus while shouldering on my left and trying to keep the target in the crosshairs can be tricky. Also, after several surgeries to mend a torn rotator cuff, I have difficulty raising my right arm and steadying it.
Even shooting the HW100BP I have to reach over with the right to use the side focus. It's no biggy when sitting at the bench picking off starlings, but when a quick shot is neeed in the woods, it takes too much time. I have my eye on the SWFA 6X42 rear focus, which I can use my left hand to focus, just thought there may be other options.