I set up a paper bullseye today and rested the Rossi 1892 on sandbags. At 50 yards it put the Lee TL358-158-SWC into 1.5" group with a 17.7 grain charge of 300MP. At first it was over 2 inches. But I was sighting through shooting glasses with a small peep-hole stuck on the lens. The sun was setting almost immediately behind the target and the peep made things blurry. I took off the glasses and the group tightened up nicely.

Incidentally I chronographed these same loads out of my 6.5-inch Blackhawk and got 1300+ fps.