11-04-2014, 06:42 PM
hydrotech Wrote:cool thanks guys. I tried out 5 rounds of 123 SST loaded 2.290 with 28grains 8208 this morning before work while the wind was calm. They fed fine in my ACS mag. I had my chamber worked on to allow me to load mag length. My chamber max COAL using a 123 SST is 2.235 now. Mark advised to back them up off the lands .004-.006 to stay out of pressure danger. So that puts me at about 2.290. Glad they all fed fine. I only shot 4 rounds but got a 1 inch group with one right in the center of the bulls. First round of experimentation looks positive. I will load up some more and see if I can replicate the results I had this morning with 28 grains 8208.
If your max COL is 2.235", and you are looking to be .004-.006 off the lands, that would be 2.229-2.231", not 2.290". 2.290"s is going to jam if your max is 2.235".
NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com