So I loaded up a dummy round tonight to "test" the neck tension on my 308 loads for my GAP-10 (AR-10). I placed it in the magazine and allowed the bolt to slam forward, stripping it off the magazine and chambering it. I measured the OAL with my digital caliper before and after this test. Afterward the OAL had grown by 0.002. If this is normal and acceptable, I'll carry on. If not, how can I increase neck tension to avoid inertia from pulling these bullets from their cases?
I'm currently using a Dillon 308 steel sizing die. I measured the expander button and it measures 0.306. I conducted this test with resized brass and a 175g SMK BTHP.
Thanks!
I'm currently using a Dillon 308 steel sizing die. I measured the expander button and it measures 0.306. I conducted this test with resized brass and a 175g SMK BTHP.
Thanks!