Do you know how much of the slug is left after the petals break off? My thinking, which could be overthought, may not make sense...but I have 2 stocks with magnum BDL, one has 2.955" and one has an extended 3.100". Better would be how the majority build the short action magnums in a long action, giving the needed room. But both of mine, for better or worse, will be short actions.The MTH . Yes petals do break off.
But I can swap the stocks out for either, depending on what I prefer at the end of the day.
Since I have 3+1 in each BDL, I was thinking to load that round in the chamber at .020" off the lands, and shoot for cold bore. Then follow up with 3 rounds of Maximus, if needed. I don't know what I would use for the chamber round yet. That is yet another possibility, in that McGuire makes a 168 grain copper rose in a Standard and Long profile. Even considering that I will be shooting for groups, it's not as if I need that long seated chambered round, it's probably ok and I'm just overthinking it...