Grendel to ARC Brass

[grayfox]

If I read correctly, he does not have his barrel yet. So, like stonehenge says, trim all to the 1.480, then take maybe, 10, shoulders down to 1.183 as necked down cases. When the barrel comes in, you’ll be gtg with 10 to test with. This of corse assumes you have the hornady case comparator and B (0.350) insert, along with calipers. Additionally I’d keep on the lookout b/c you can still find a box or 2 or 3 of the 105’s and add them to your stash.