I’d clean the barrel, check all the mounts and rings, check the action bolts, just preform a basic check of the rifle. Are you confident in the scope?
I use a bigger charge weight in my 6.5 creedmoors, I get better results. I attached Hodgdon’s load data and a screen shot of Hornadys load data for that bullet and cartridge. I’ve always found a good node that’s easy to tune around 41.5 grains of H4350. Just follow basic reloading practices and start low and work up if you try a higher charge. I’m showing no signs of pressure with Lapua brass, 140s Hornady Match bullets, 210m primers but your rifle may tell you otherwise, be smart…. I use that combo in a Tikka CTR and a Tikka T3 with good results.
Loading without a chronograph really limits a guy as far as knowing where the nodes are, your standard deviation and extreme spread numbers. Running a simple ten shot ladder will help you know where things are, sometimes half grain of powder can make a big difference with your accuracy, SD and ES. You want be in a node, there’s a higher node for both rifles but I’m happy where they are.