I just traded a whole bunch of flies (for fishing) for three boxes of handloads made with my used brass. I haven't yet taken them out to see how they group and I'm wondering, what kind of performance have people had with these? They are 180 grain for .300 Winmag. They are the copper ones without the moly coating. I understand that they're a little harder on barrels and I can accept that. Do they expand as much as lead? Is expansion as reliable? I intend to shoot elk and deer with the same bullets and I thought that this would be a happy medium.