they can break 1000 feet per second as I recall with a 200 grain? (i havent weighed mine) round ball. But nowhere near the velocities of a loaded up 44 mag.
You wont get 44 mag performance.
Use the search function for ROA on this forum there was a big thread on this subject
edited to add: My bad you already asked this question before so you've probably seen the old thread I mentioned
Last edited by hickstick_10; March 25, 2010 at 10:32 PM.