I would expect 3100+ with 18" and H4350. 88 eldm in a 20" with 39.5 of H4350 gets me just over 3000. A lot of guys on here get faster than I'm getting also.
Iv gotten enough questions and have had enough questions about this cartridge that I think it needs it’s own thread. Too much clutter in the 223 thread. I’ll start with my build, and findings on what I’m hoping will be the ultimate deer gun. Hopefully others can add their experience as well...
I won’t comment on the barrel specifically. But I will say Iv seen barrels speed up 180+ fps in the first 200 rounds, and normally more as time goes on albeit slowly. I wouldn’t even consider my chrono results the first couple hundred for anything but immediate drop data.