Which mono bullet are you referring to?I’d say .300wsm I just built one it’s my favourite do it all cartridge I’ve owned 3 now
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Will be doing load development for it next weekend. Running 178gr monos with a bc of .620 should be able to push them out at around 2925fps with a 20” tube. that will put me in the ballpark of 1995 fps and 1573ft-lbs at 750yards and still 1731fps and 1184ft-lbs at 1000