I built my Bushmaster on an Axis action. I've put some very hefty loads through it (425 grain WFN-GC, 1623 fps. 350 and 400 grain Speer JSP) without any problems. The Speer bullets were originally 45-70 bullets that I resized to .452". I have almost 800 rounds thorough the rifle to date. I used a Rhineland 16 inch barrel with 1/16" twist. The Rhineland is small shank of course. Biggest headache is getting rounds to feed through the DM. Hornady 250 grain FTXs feed the best. To use a large shank barrel you would have to have one custom made, all the Bushmaster barrels I've looked at are small shank.
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