there is a persistant rumour that microgroove barrels dont work for cast bullets, it just wont go away sadly even tho there is plenty of evidence that does work . . . if you understand the proper technique.
use a bullet at least 1 tho over groove diameter and hard enough it will work very well . . if you dont results will be crap
my .30/30 marlin is a consistant 1.5MOA using cast . . . that rifle has shot plenty of groups at 100,200,300 & once out to 400 yards & always put its bullets inside the 6 inch square, 200yrds on animals
i cast some bullets for it recently with the same soft lead i use in the .45/70 it shot +3MOA with that combination
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