An automatic case fed priming tool preferably includes a primer insertion device, a primer die body and a primer feed trough. The automatic case fed priming tool is preferably retained in an automatic process press. The automatic process press includes a upper die carrier and a lower die carrier. The primer insertion device preferably includes a breach lock, a moving primer platform, a primer pin and a primer compression spring. The primer die body preferably includes a pin housing, a case push pin, an ejector compression spring, a case finger guide and a case ejector. The primer feed trough preferably includes a first trough half and a second trough half. The primer insertion device is retained in the lower die carrier. The primer die body is retained in the upper die carrier. An exit end of the primer feed trough is attached to the lower die carrier.