Back in 5/9/2013 I tried some 2400 powder out in my new 686 6" revolver
with the Hodgdon 158 gr. XTP bullet with the same load as mentioned in post #1.

The first round fired took me by surprise, with a flyer from the recoil.
After getting a firm grip, the next four were inside the size of a golf ball at 15 yards, from a rest with iron sights.

The chrony said the loads averaged 1274fps.

I have had this bullet up to 1340fps with 2400 powder but they were not as accurate in this L frame.