I have a Mod 70 pre' 64 action in 338 WM. Bought it 25 years ago. Recently had it bedded and put a Zeiss V6 and a Near MFG scope mount. Started reloading for it. It's shooting 1/4 MOA all day long. Super impressive for a hammer like that 338WM especially considering it's not a custom gun...
I use the KISS system. I use the same arrows for everything. Never change. I have back up bows that also shoot these same arrows. No need to retune or adjust sights.