I got very lucky with the Onyx/Kansaswoodsguy/markm .223 load that I use on my PRS Gas gun. I didn’t have to do load development at all and my SDs with 10 rounds are always <5 using cheap Lake City brass.

I now have a 26” 6.5CM and was hoping to get equally lucky. I bought 500 140gr ELDM bullets and have an 8lb jug of H4350. It looks like I need to get Lapua brass and some CCI450s (which I use for my 223 load anyway)

Is doing a ladder the only proven way to do this? I can shoot paper with a chrono at 300y. Should I keep the suppressor on when I chrono?

It looks like 41.5-42.5 is where most people get their nodes with this combo but was hoping for a really proven performer.