Probably a dummy round in 30-06---FA 27 nickled case, domed primer, 6 flutes, 1 hole in flutes, coned crimp..and like above, from the Frankford arsenal in PA.
1st - I noticed this was your very first post - so, Welcome Aboard Dperry! You didn't list your state (or country) in your profile. So, you might consider jumping over to Sub-Forum: Select Your Area.... for information (i.e., clubs, hunts, finds, legends, maps, etc.) directly related to your state (or country).