Theron wrote:
1) I like the reviews of those guns, but neither one has an automatic
feeder. Am I going to regret hand feeding?

I don't. The huge labor savings is in the driving, not the feeding.

2) I can't tell what practical difference the guns have. The 272 has
0-4000 rpm, and a max fastner size of 8. The 260K has a case, 0-2500
rpm, and a max fastner size of 12.

IMHO, the one slower speed and more torque is better. It might not make too
much of a difference on the dry wall job, but I use mine for all sorts of
other things and the higher torque frequently comes in handy.