I agree the Harvester sabots are the way to go. My stainless .50 Omega is difficult to load with sabots and I have to select bullets .451 or .450 with the Harvester to get them down the barrel. I had very bad results with tripple seven. I don't like the crud ring that is still partially there after I switched to the .25ACP breechplug (fixed the problem about 80%). I don't like the sharp recoil that I get with 777 and the lack of velocity that is possible with Black Mag3 without the sharp recoil. 777 creates a breechplug seizing problem also which can be handled with teflon tape if done right but this is not a problem with BM3.