You don't have a problem, reduce the load and work up again at your new seating depth and play it safe.
With Quickload and .223/5.56 cases, the max case capacity was 30.6 grains of H2O with Lake City cases and minimum case capacity was 28.8 grains of H2O using Israeli IMI cases . Using the same load of 25 grains of H335 in these two case capacities changed the chamber pressure 6,000 psi with 1.8 grains less internal capacity.
this cal uses 30-30 cases ,,,not 223/5.56,,,,we all need to be careful when using internet load data,,,,Roger
This is a no brainer, work up a new load at your new seating depth. No one here will be around to pick Contender parts out of your head if anything goes wrong so work up a new load.