I have heard many comments concerning the inability of the Micro Groove system to accurately shoot lead bullets for SASS type events. I asked the question about them today in a gun store and was told that they do if you use gas checks. I have heard rumors that the faster you drive them the worse they are with lead and that over 1400fps, forget it. Of course the old trapdoors, etc don't drive them that fast. Experiences to share?
There seems to be butches of microgroove 45/70s available at very reasonable prices, those with Ballard rifling are more scarce and expensivie. Jim