12-27-2017, 03:22 AM
Crusty Wrote:I read all the earlier posts about the 123gr/27.5gr AR-Comp load and decided to give it a try for my first OCW spread and I did indeed find an accuracy node at 27.5gr at 2.260" OAL. Looking at my primers though they were all flattened and there were ejector marks on some cases, which I take to be signs of over pressure.
Subsequent to this, I finally found a published load at Speer for AR-Comp in a Grendel using a 120gr bullet (published AR-Comp loads for Grendel have been rare so far) and I see in it that the max load is listed as 25.3gr of Ar-Comp so the 27.5gr load is nearly 9% over that max with a 120gr bullet, and even more with a 123gr bullet.
What's y'alls opinion of the 27.5gr load based on these facts? I'll attach the Speer doc if I can.
In that same document there's a max load listed using Power Pro 2000-MR which looks very interesting because it has a MV about 40fps higher than Hornady ELD-M ammo, which is the top factory 123gr load as far as I know. I've loaded an OCW spread using it based on that max charge but I haven't shot it yet.
When I started my load work up two years ago I to began seeing signs of pressure as I entered the 27+ range The load I settled on was 26.8 under 123's and it works well across three barrels measuring 16, 18 and 20". The node there is quite wide, about .5-.6 tenths of a grain.

