I've never used 24 gram loads in the M2. I might give it a try for curiosity's sake though as I've got some FBlack 24gm that I use for ISSF. The Club 28 and Sport steel that work well are both 1250fps, 28gram.
Another shooter recently bought a new Browning A5 (not to be confused with the old Auto 5) and it won't reliably cycle with Club 28 so he uses Fiocchi FBlu which I believe is 1300fps.
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