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You can shoot lead bullets through Micro Groove barrels, however, performance will not equal what you will experience with a conventional or Ballard type rifled barrel.
Micro Groove barrels are also much more difficult to completely remove lead fouling from. Jacket material is hard enough in itself to completely remove.
Micro grooves were designed for and work best with jacketed bullets.
I have heard that Mirco Groove is for jacketed bullets while Ballard is more friendly towards lead except for their rimfires.
Micro groove has, usually, more shallow rifling and grabs jacketed bullets better while Ballard is deep to grab on to lead bullets better.
folks will re-orient your thinking on cast bullets in micro-groove barrels. Check them out. IIRC, the key is to use a larger bullet, as normally-sized slugs don't obdurate well in the multiple, shallower grooves. Thus, accuracy suffers and leading is made much worse.
My Marlin is Ballard-rifled, and loves lead bullets.
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