Thread: Chamber for 223 running heavies with AICS

It is a bit interesting.

Running 80 ELDMs with the boat tail at neck junction gives an COL of 64.0 and a CBOL of 49.70mm.

By way of comparison my old 80 Sierra load was 48.30 CBOL and a 69 in a typical factory chamber is 47.70, a 55 is 46.60. The 0.169 freebore @Beetroot mentioned is 4.30mm.

A 75 ELDM seated with the boat tail at case neck would require a CBOL of 48.22 mm, so about midway between "factory" and the 0.169 spec (which is supposedly "about normal" for FTR rifles running 80s and heavier.

I think I'll make up a dummy round using the 75gn and get Greg at Custom Guns to work with that . . . My thinking being I can still run 80s at a very sight cost to powder capacity, with 55s still being shootable? Thoughts ( including am I overthinking this haha)