dr. mordo, just to give you and idea of what the Hi Tek coated bullets can stand, I had loaded up some hot loads of the MBC 140 grain zinger bullets and out of one of my model 27's it was running in the 1400-1500 ft/sec range and out of my 20" barreled Rossi 92 it was at around 1900 ft/sec with no leading showing in either. I can't give you more exact numbers or what powder I used as the data is on my old phone I retired about 6 months ago and is at the house 800 miles away from me right now. But those are approximate numbers off the top of my head.