Accuracy Next Steps

[JustAGuy]

Ok, so I've done quite a bit of OCW testing with several bullets and powders and determined that my Savage .223 with a 22 inch barrel likes 25.4 grains of H335 under 60 gr Hornady soft points, seated to an OAL of 2.245. All testing was done with general Lake City brass, (not sorted by year or weight etc.) trimmed to 1.750 with Wolf .223 primers.

I have not yet measured the chamber depth to rifling but I do have the equipment to do so.

Question is: What are my next steps to further work on accuracy for this load, in this rifle? What steps are most likely to produce better accuracy?
Seating Depth, sort the brass by weight, other?

Thanx

Sam