Well with the new hunting rules going into place, I no longer have a desire to build a 458 suppressor. Problem is that I already efiled and bought the parts for it. I can cancel the efile, but I still have the parts to build a 10" long suppressor. I want to file another form 1 to build something, but not sure what caliber to go with. I already have a 30 caliber AAC suppressor. Should I go with a 223/556?