I purchased a new Rossi 92 with round 20" barrel a month ago. Had the same feed problems with .357 factory ammo and my reloads. Factory ammo and my reloads were 1.56 - 1.58 OAL. I purchased mag follower and spring kit from Steve's Gunz and also the DVD to slick up the action. I followed his recommendations on taking some metal off of the extractor and the loading gate. Also took about 4" off of the magazine spring. Also purchased a gun slinger spring kit from Brownells and replaced the mainspring and the little spring on the lever pin that holds the lever closed.
I made some reloads with different OAL's - ranging from 1.52" to 1.56". The reloads that were 1.54" OAL fed okay without problem. I am currently making the .357 reloads to the 1.54" OAL and feeding is much better.
Don't know if this will help your problem but wanted to give some input. This is a great site - someone else will probably give you the help you need. I went to the taurus/rossi rifle forum on this site and read the posts - they helped me a lot.