you are correct krochus, the 189 series and later M30's have the .310 bore.
a tip for X39 loaders - Graf's has the Hornady VMax .310 slug on sale (or did, evidently Hdy has discontinued and they may be sold out) and it shoots very well in my M30 atop 680. I bought all I could afford my last order. I wish Hdy made this slug in 150gr weight. would be ideal whitetail slug for this cartridge.
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