I recently purchased some surplus, "once fired" brass in 30-06. I cleaned and sorted them by headstamp and I sized/deprimed a bunch and attempted to trim. The pilot section of my Lyman trimmer would not enter the case mouth more than 3/16". I had noticed an annular "crimp" but since the case went through the sizing die "normally" I paid no attention (similar to the cannalure around some revolver brass to help w/setback). I checked a bit closer and noticed these crimps were quite heavy, some about .005" deep (which makes the case neck ID .010" smaller) about 1/8"-3/16" below the case mouth. Headstamps are mostly LC, but there are a few DEN and TW. I haven't decided whether to load and shoot 'em, possible ream the necks, or scrap them. I don't think I wanna force a bullet in a case that's .010" too small...

Any ideas the original use? What's the consensus? Use 'em, ream 'em, or toss 'em?