I guess I can see that. You would still want to check for pressure signs while your running them up.
If your best load is a max load of H335, You've not left very much wiggle room to find the sweet spot of WC844.
Lucky for me my most accurate loads have been well under max loads. I have been able to hit my Velocity ether a 1/2 gr up or down.
Any way if your not using a Crono to check your work. Your just guessing.