Gee, I just sent my 357 back to the factory it was bad. I ordered a 44mag. Now I read here that they are having the same problems with the 44. My 44 marlin shoots cast bullets also shoots clover leafs it has ballard rifling. My marlin 45-70 has micro groove it doesn't like cast bullets. But my BC looks like micro groove shoots cast real good even the 22'' barrel.
Don't get caught up in the "Micro groove cannot shoot cast bullets" theology.
They will shoot cast, they simply need to be cleaned more. Not having said this, I would not buy one with the expectation of expressly shooting lead bullets.
CW