Let me remind you that if you find any size skull with antlers attached in the woods you might—actually you probably– need to obtain a salvage permit (or at least verbal permission) from the state to possess and transport that skull/antlers. You do not need a permit to pick up and possess shed antlers (no skull).
In most states a deadhead—the skull and rack from a buck that died of disease, was hit by a car, or was lost by a bowhunter in the fall—is treated like a roadkill buck, and subject to the same state laws, which in most cases means you need to call a conservation officer or sheriff and get a salvage tag (or official permission) before you move and take possession of the antlers.
States where I can confirm you need a salvage permit, which is usually free and available online, for a deer skull include: Kansas, Illinois, Iowa, Missouri, Indiana, Pennsylvania, Ohio, New Mexico, Arkansas, Montana, Washington, Michigan, Idaho, Oregon, North Carolina, and there are certainly many more.
Check your state regulations before you go shed hunting.